There are many more awesome titles your missing like Minecraft, Fez, Retro City Rampage, Diabolical Pitch, Happy Wars, Haunt, Skulls of Shogun, South Park game, Project Draco, Class3 and more. MS always has the best line-up of arcade games between the three and people seem to ignore them, I wonder why? Next year is a great year for arcade lovers.
Because people prefare Retail games? BTW Minecraft and South Park game are not exklusives.
But as you say if you prefare arcade games Xbox360 is the one with most.