Played it at my cousins house. If you liked the first one you're essentially getting the same experience with nicer menus, new weapons, and pretty graphic effects.
I didn't get much online time in, but there isn't much radical change. It's the same basics with new guns, class enhancements, badges, maps, and play lists. I only saw the third person view and I don't know if it feels like RFG or GoW.
I can however safely say that it won't disappoint.