1) 5. My first "true love" of this generation.
2) Real time combat/VATS option on the fly. 70+ hours in and still finding new stuff. The good vs. evil choices really affect the outcome of events. Who wouldn't want to build a gun that shoots teddy bears?
3) No random events during fast travel. No crotch shots in VATS. I know it's set in a post-apocalyptic wasteland, but I'd like to see more color. Not enough whores.
4) Definitely a worthy successor. The naysayers can suck a flamin' Shishkebob.