There are a lot of arcade collections on Xbox. I wish they'd make Midway collections for modern systems, and I wouldn't mind a Taito collection. But I do like that Arcade Archives brought most of Nintendo's arcade catalogue as well as a lot of other Japanese games to modern systems, as well as SNK Arcade Classics and Capcom Arcade Stadium.
The Xbox was the only 6th gen system I skipped, I had both PS2 and Gamecube. The only Xbox exclusive that really interested me were Ninja Gaiden and Ninja Gaiden Black.