I find that the xbox controller is probably the best when it comes to ease of learning to use the controller. I'm not a great player, but I was able to make it on normal with my husband on co-op. It might be easy for you, or you might have to play it and get used to how you're using your controller. I think you can do it. I can make it on easy, so when it comes to that - I believe anyone can make it on easy.

If you've played halo and halo 2, then it should be easier for you to play on easy (you can play halo and halo 2 on your 360 because of backwards compatibility.) There are some subtle changes, but that has to do with gear and weapons mostly. Legendary might be hard though.