Just saying, the 360 had a lot of great games. BioWare's golden age (Mass Effect and Dragon Age for example). The first Mass Effect sucked if you were trying to play it on easy (long story short the Mako (tank) missions did not scale down in difficulty), but the second and third ones were awesome. Dragon Age Origins was pretty good, too. (If you're on XB1/PS4 or newer, just get Mass Effect: Legendary Edition, it's all three games, all the DLC, none of the loot boxes that plagued ME3, better graphics, and they fixed the difficulty when playing in the tank. You can still play Hard, but if you put it on Easy, it'll stay Easy in the tank. Sort of. Some parts couldn't be made much easier, like the asteroid DLC and a couple other parts. But you get XP in the tank, which was another problem with the OG.
On Arcade, there was Shadow Complex which was a shameless rip off of Super Metroid.
Lots of good options.
Oh, and I've been gaming since Pong. It kinda hurts to hear 360 regarded as "retro," but also kinda not.