The Good: Eight cool new levels and six new factions to play with; more focus on infantry and urban combat, less on vehicles; night vision, grappling hooks, zip lines, and other cool new toys; more of the great gameplay that made battlefield 2 one of the best action games of the year.
The Bad: Huge, showstopping bugs can prevent you from even playing the game; performance drops if there's too much action on the screen; resource hog and longer loading times than battlefield 2; ea's new digital distribution service has issues.
As I said in the otehr thread, I think it's probably a patch 1.12 issue rather than a BF:SF specific thing because the slowdown last night was just horrible.