Here is the list for my fav. mordern retro games: - League of Evil - Random Heroes - Super Mario - Sonic Brothers - Shovel Knight - Volgarr the Viking - Retro City Rampage
Graphically it's not retro but gameplay-wise it is: Shadow Complex. That game is awesome and in my opinion the best XBLA game released. For some reason everyone forgot about it, but you still hear Castle Crashers talked about to this day, which I always thought was good but overrated.
Honorable mention to Bionic Commando: Rearmed. Good graphical and audio updates, and the challenge missions were an obsession of mine for a little while.
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I do like playing Real Racing 3, the Modern Combat, and League of Evil - this is the type of game that has you trying to complete levels countless times to grab an item and get to the goal in the shortest amount of time.
The graphics stick to that 8-bit style we had so long ago, but the gameplay is excellent, with extremely difficult levels that will have you coming back to make that perfect run.