I have not been on the Xbox Live Arcade for a while… I could have done a big mistake : missing the HD remake of Bionic Commando. It is a classic NES game that I really loved younger. The character is a commando armed with a powerfull bionic arm/glove that you can use to swing or grab objects. You will face an army of fanatized soldiers.
Among the few NES games that marked me is Capatin Skyhawk (an MB game) : a very fun game shoot in isometric 3D. It is similar to the arcade classic Zaxxon from SEGA. You have to repel an alien invasion with your tuned F14 fighter. You can replay this game directly in your browser : http://www.nintendo8.com/game/741/captain_skyhawk/ !