When I first heard of Snakes on a Plane, I went: "Oh man, this is going to suck!". Then I heard Samuel L. Jackson is going to be in it, and I went: "Hmm, might be worth a watch because I enjoy watching him. But I still thought it would be lame, but boy, this movie crawled up my seat and bit me hard. It had a lot of intense action and was actually kind of realistic. Too many movies take themselves too seriously - this movie is at the other end of the spectrum. It clearly was developed from the start as pure escapism entertainment. You're not going to have a better understanding of humanity or yourself at the end of this movie. You will laugh out loud, you will cheer for Sam, and you'll love most of the characters (the one's that make it that is).
David R. Ellis, the man at the helm, is a former stunt director and what matters in stunt sequences is timing and good pacing. His previous films demonstrated that - Final Destination 2 and Cellular - and here we get the same thing again. Thin plot, good tension. The obviously CGI snakes look pretty decent and make for some good creature flick fun with all of their jumping, hissing, and crawling just about everywhere that is humanly possible. Samuel L. Jackson gives an amazing performance. He never gives in to the campiness of the movie, and plays it completely straight. The self control he exhibits here should earn him a special Award.
I recommend watching this movie, for the sake of the snakes. I honestly thought this movie was very amusing as well, with the whole idea of "snakes on a plane". This movie had a lot of its facts straight about snakes, and had an interesting idea on how they dealt with them. But still, if you haven't seen it yet fine a way to.