My KDR is crap (0.75ish) because I am always trying to get kills with the Bio Spike so that ends up with me getting shot a lot but I have a ton of fun in this game, especially since I made the move to Stick & Move. I will warn you, it does take some getting used to, after years of hitting the melee with your thumb....
I rarely use the Melee attack now because I haven't programmed myself to press the X button for it, but the Melee is crap anyways so it's not like I'm missing much. But yeah, Stick & Move is amazing IMO and really opened the movement mechanics up for me.
I still haven't put MWR in. I find it funny how everyone bitches and complains about the Space age CoD's and they whine and cry for the BOTG glory days of MW, and now that it is out and in their hands, the whine and cry about the helicopters and OP Perks. Hahaha. People are never happy.
Anyways I am kind of hoping they will do a MW2 Remaster, just because I love some of the maps and the Tactical Knife and Commando Pro. MW2 is where I started playing FPS games.