Shadow Complex, It was the first Xbox Live Arcade game I ever downloaded. "I had the extra money and I went for it"... I feel as though this statement has been said before most crack addictions being. Fantastically addicting game ... Locked myself in a room for 3 or 4 days playing it.
I think they just did prototype which was high on my list. Apologies if some of these have been done. "Look back at" is the only series I'm not up to date with. Farcry 2, Shadowrun, Crackdown, GRAW2, Burnout Paradise, Resident Evil 5
I'd like to see "a look back at" Hitman: blood money. with the next installment due out this November it would be a good opportunity for people new to that sort of game to get use to the basic gameplay of a stealth/strategy game. It's an easier 1000 point game with no multiplayer' so there all still available.
Just to continue from my earlier comment. I'm so glad that the everyone in this forum realizes that they only do Xbox 360 games. I'm very tired of seeing Star Wars KOTOR and Battlefront on Youtube comments
I haven't gone through the whole library of "A Look Back..." but I do agree with some of the others concerning Mass Effect 1 and Fable 2. WANTED and Marvel Ultimate Alliance are also pretty good suggestions.
Since it's servers are going down in September, I'd say Phantasy Star Universe should get an ALBA. It is an old pre-Halo 3 360 game (Released in October 2006) that was one of only I believe 2 online multiplayer RPGs for the Xbox 360. (the other being FF11)
Now the original 1k achievements are all story based in the single player portion, but when sega released the (now free) expansion in November of 08, they added 250 points for killing bosses in the online component that's going down in september. Anyway, part of me thinks that ALBA would be a nice little send off to a key bit of my xbox live experience. (and the other part hopes that the surge of people who'll flock this game after RT mentions it will result in the servers literally going out with a bang)