Maybe it's just the tyranny of expectation, but season 4 seemed a bit of a dip from the heights of the last couple of seasons. Still, it's never less than great fun to watch, and it certainly has its moments (often involving Kenneth); the greater emphasis on longer story arcs is also noteable. (Also, pleasingly, a couple of days after starting watching the dvds, I bumped into the friend who most reminds me of Liz Lemon on the street, not having seen her for several months before.)