This will be a shorter review than usual, as there's not much to say about this film (in this case, it's a positive).
If you don't know much about this bloody comedy-horror flick, it might sound a bit dumb at first. And sure, in same ways, it is overly ridiculous. But at the same time, I do think the theme of miscommunication is done pretty cleverly throughout the movie.
There are only four actors who matter. Tucker (Alan Tudyk) and Dale (Tyler Labine) have an amazing chemistry as two hillbilly friends, and play their roles fantastically. Dale has a lot of heart in him, and it's nice to see his story end happily. Katrina Bowden played Allison, an aspiring therapist caught in the middle of this giant misunderstanding, extraordinarily well also. She has a fresh, attractive college look to her, but also has the brains to figure out what's going on. Jesse Moss (who was in Ginger Snaps ten years prior) plays a great villain, and gets the utterly psychotic act down pat.
The movie is about average length, but still comes across as pretty digestible, and at no parts throughout the film are you really bored. The gore and related special effects are pretty damn good, lending this movie the right to probably be called a splatter film. Solidly funny, surprisingly clever, Tucker and Dale vs Evil is a good film that's worth seeing. I think you'll enjoy it.