This one wasn't my pick; however, I had no arguments against it. It seemed a little silly and good for a few laughs, but what really got me interested enough to pay money was Jason Bateman. I don't know if you know this, but I love his sense of humor. Something about the straight-laced, no-one's-listening-anymore, almost-muttering delivery he has just speaks to me. A lot of people I've tried to explain this to do not understand. They don't laugh when he speaks. I, on the other hand, find trouble not laughing at every word he says. There's just something about it.
So, obviously, there's some great laughs. And for the most part it tends to stay on track of fairly believable. (Minus the bounty hunter and two drug dealers, who I kind of felt the movie would've done much better without.) The odd thing about this movie was that there are some strangely sentimental moments where you really sympathize with Diana (and Melissa McCarthy does a great job in these dramatic scenes -- I think she cries like three times and it makes me think she shouldn't always go for the funny girl parts).
And the movie has this message about being a schmuck because that's the "right" thing. I couldn't really get a hundred percent behind that part. Sometimes you need to play the game. The world is not black and white, and I think it's better to stand up for yourself and what you believe is right, then get walked all over because that's the nice thing to do.
Identity Thief (Gordon, 2013) has some silly laughs and great friendship-based values. I think it tries too hard (and fails) at a deep moral message five minutes after she tapes up a bounty hunter with a Capri Sun, but it's a fun movie to see with friends. Verdict: RENT-IT.