Saw Bad Teacher for the first time the other night. What a... weird movie. Almost all of the characters are... well, weird. Especially Timberlake's character (although the orgasm face he makes during a certain scene is both awesome and hilarious). I should expect such strangeness from a Jake Kasdan flick, but these people are offbeat, for sure. Anyone who has seen this will know what I mean. Don't get me wrong. It's not weird to the point that you're uncomfortable or anything. The movie is funny. Not side-splittingly funny, but it has its moments.
Anyway, I'm not a big fan of Diaz, but she does a great job here. Pulls off her role well. Lucy Punch also does well as a quirky goodie goodie teacher. Her mannerisms are awesome. I also think she's pretty hot... in her own way. Jason Segel's character is the funniest by far (through excellently witty dialogue), and also seems to be one of the more normal people in this flick.
In the end, I enjoyed it. Can I recommend it...? Not sure. There's nothing that ground breaking, or memorable about it. However, it's pretty funny at times, and is well acted. It's definitely not awful (lol).