if not mentioned already, don't forget Fable.
I was in the same boat... skipped the box last gen and stuck with the station, so this gen I'm on the box and skipping the station.
BC has been nice, since I finally got to play a couple of games that were exclusives. But I'm still waiting for the original Mechassault.
Jade Empire worked like a charm.
Fable crashed... and ring of red'ed my first 360. I'm not putting it in my replacement just yet (too busy bioshocking) (let me add that I'm not sure if it was my system dying that caused the crashing, or vice versa... so YMMV)
Halo2 worked well enough for me, since I'm not Live-Gold, only Live-Silver
Mechassault 2: LoneWolf was great.
all these were very playable (and good enough looking, all things considered) on my 50' 720p sammy DLP.