I lucked into watching about 90% of Hot Tub Time Machine the other night. I get the criticisms (I don't agree with a lot of them, but I get them) but on a line-by-line basis, that's a hilarious movie. Rob Corddry steals the show. I can take or leave John Cusack - once he moved out of the cute teenager phase to the angsty uber-liberal phase, he lost me - though it's hilarious listening to him - an actor that made his bones in the '80s in movies that are now quintessentially '80s - repeatedly say "the '80s sucked, man". Craig Robinson and Clark Duke are a bit one-note, but it's a funny one note. Chevy Chase is good playing a weird version of every character he's ever played.
Lizzy Caplan plays Lizzy Caplan (i.e. quirky, nerdy hipster chick), but far more normally than she usually does (see "Mean Girls").