Two hilarious actors (Simon Pegg and Nick Frost) and America's UFO epicentre. It's almost guaranteed to be good. And yes, of COURSE they meet an alien.
Can the sequel to a 1982 classic be updated to the 21st century without losing the spirit of the original? (The answer is yes, providing they haven't introduced clumsy cartoon characters that can't speak properly.)
When something is this good (and makes this much money), why ever end it? Welcome to the first of the two last Harry Potter films.