“Bad Teacher” so desperately wants to be a devious black comedy like “Bad Santa” but for teachers. Depressingly, it doesn’t even come close to reaching such devilishly hilarious heights. Despite some good laughs sprinkled throughout, this movie is a surprising bore with few surprises up its sleeve. You can see things coming long in advance, and the punch line deflates very quickly. Cameron Diaz, Jason Segel, Justin Timberlake and a talented cast do their best with a severely underwritten script, but the movie wears out its welcome within the first ten minutes.

Cameron Diaz stars as the teacher of the movie’s title, Elizabeth Halsey. She is dumped by her rich fiancé at the start as he figures out that she is only with him for his money, and this forces Elizabeth to go back to her teaching job which she claims is “the only thing I’m good at.” Her teaching style, however, consists of showing her students movies like “Stand and Deliver” and “Lean on Me” before moving on to the R-rated stuff. While they watch, she’s either nursing a hangover or working towards one with tiny little bottles of Jim Beam whiskey stashed in her desk. But while Jack Black played a somewhat similar character nursing a hangover in “School of Rock,” Diaz comes up short here.

The thing with movies like “Bad Santa” is that, as deplorable as the lead characters were in their actions and demeanor, there was something which made me want to keep watching what they went through, and in the hopes that they would reach some sort of evolution or catharsis. Whether they were likable or not, they were interesting. Billy Bob Thornton succeeded in “Bad Santa” in painting a complex portrait of a man who was as pitiful as he was cruel to others.

This brings us to a really big problem with “Bad Teacher;” Elizabeth Halsey is not an interesting character. She is essentially a shallow human being looking to manipulate those around her to get what she wants. Through schemes like school car washes and, as it is described, “extra tutoring,” Elizabeth works towards raising money to get breast implants as they seem more important than anything else. Aside from that, there’s not much to the character here. She comes across as one-dimensional without much to work with in terms of complexity or a back story, and this just sinks the film even further down into the muck.

Regardless of what has been said, I believe Diaz is a very good actress. She is endowed with great comedic talents which were put to good use in movies like “There’s Something About Mary,” and she has proven to be a strong dramatic actress in “Any Given Sunday” and “Being John Malkovich.” While she is game in making Elizabeth a despicable teacher, she never becomes like the ones everyone hated during school years, and the lack if any interesting and redeeming qualities makes this a waste of her talents. With a better screenplay, she would have been fantastic here.

“Bad Teacher” does pick up a little as it goes on, and it scores some great laughs when Elizabeth discovers that the teacher whose class gets the highest scores on the state exam gets a bonus of around $5,000. Seeing her switch her class from movie watching to reading the first 100 pages of “To Kill a Mockingbird” in one night for a quiz the next day is comedic gold. It gets even better when she uses unorthodox methods to make the students learn like standing them in a line and hurling balls at them when they give the wrong answers. Unfortunately, these are some of the highlights, and they all happen at the movie’s midpoint.

Other scenes like Elizabeth getting revenge on faculty members becomes anticlimactic as I could see long in advance how her vengeance would end. When she is running the school car wash and dresses scantily, it’s funny for a minute. I have seen so many movies over the years which have utilized this sight gag, sexy women at a car wash barely dressed, and it’s so old now. We have been there and done that, and nothing is done to make this particular gag look the least bit fresh.

One actor who fares better in this movie is Jason Segel who plays gym teacher, Russell Gettis. His humor is unforced, and he never strives too hard in making us laugh and succeeds in sneaking jokes when least expected. If only “Bad Teacher” had more of this humorous magic… I mean, I can dream, can’t I?

After all these years, I’m glad Justin Timberlake has singing career to fall back on as he has not had the greatest luck in movies despite his inspired turn in “The Social Network.” Watching him opposite Diaz is interesting in part because we all know they were once a couple, but the chemistry they had in life doesn’t quite translate to the silver screen. His character of substitute teacher Scott Delacorte is a rich guy who Elizabeth courts as she selfishly wants someone wealthy to pamper her for life. But it becomes far too obvious how this relationship will turn out, and while Timberlake does what he can with the material given to him, he can only do so much.

Other actors who have their moments include Phyllis Smith who steals scenes as the shy Lynn Davies. Her muted ways make for amusing moments as she argues about certain things bothering her at a very subdued level. Stealing even more scenes though is Lucy Punch who plays Elizabeth’s arch nemesis, Amy Squirrell. Punch fills her character with a certain joy brought on by an innocence which masks a deep resentment that eventually gets the best of her.

The director of “Bad Teacher” is Jake Kasdan who is of course the son of famed filmmaker Lawrence Kasdan, Jake’s a good director, and his movie “Walk Hard: The Dewey Cox Story” remains one of the most vastly underrated comedies of all time. But here, he is unable to find the balance between comedy and character. If the characters in this here movie were a little more down to earth and nowhere as contrived, he could have made this film truly work and give it a spark few comedies could have.

Many may watch “Bad Teacher” with high hopes that it will be a deliciously nasty comedy along the lines of “Observe and Report” or “World’s Greatest Dad,” let alone “Bad Santa.” The problem is this one is nastier than it is funny. Doing comedy is hard work, but making a black comedy is even more difficult. Hopefully, Jake will have more luck in the future with this kind of film, as he has done good work in the past. And I also say this because the recently released “Red One,” which he directed, is, like this one, far from ever being a critical darling.

* * out of * * * *