That's really just about all there is to it.
I'm amazed that there are people who bitch about how bad this movie is. It's about snakes on a plane. What were you expecting? "Hamlet"? You've got your snakes killing people on a plane. That's all there really should be. I think it's brilliant.
The cast is wonderful and having both Kenan Thompson and David Koechner in it is a treat. Samuel L. Jackson stars, of course and he's pretty much exactly the way you'd think he'd be in it.
There's really not a whole lot more to say.
If you're the type of person who'd like to laugh real hard as you watch a bunch of dumb shits get killed by snakes (on a plane) this just might be the movie for you.