Yeah I really need to work on my grenade placement, I've always been really really bad with grenades. I would play with friends but sadly they sold their xbox 360's and the one friend I had who still played with me just left for the Air Force. Thanks for the tips though, I will try them out. I notice I do good with my AR on regicide, when everyone is gunning at each other it makes it easy to swoop in and spray everyone lol.
I'm not sure if I agree with you on the skill aspect. Knowing when to stop shooting and when to start shooting can often save you from draining their shileds then not having enough ammo to finish them off. I just like the AR because it feels so much stronger than any of the previous ARs except for Halo 1's AR of course.