I like the thematic depth and the subtlety with which it's treated.
Clooney's character is a guy who's made a life out of his job, to the extent that he doesn't even have an apartment any more. He lives out of hotels. Meanwhile, his job is firing people, and trying to help them accept that the end of their job isn't the end of their life.
The dichotomy is never really dwelled on or pointed out, but it's always there under the surface.
So, in a way, while the movie is about layoffs and workaholics, it's actually cathartic. It draws attention to the notion that there's more to life than work.
Sort of depressing, but also uplifting.
Very well made.
The cast is also exceptional. Clooney and the two lead actresses are all incredible in their roles.
And the direction is very passionate. Reitman was handed, at one point during production, a tape with a song on it. The song was preceded by the singer explaining to Reitman why he might want to use it in his movie, as the guy wrote it after getting laid off and reading the book the movie's based on. Reitman liked the authenticity of the introduction so much that he includes it when the song plays during the credits sequence.
There's very little formula in the movie, you'll be pleasantly surprised.