I didn't want to get suckered into buying another CoD game, playing it for a few days, and then quitting out of frustration. But... here I am. I've got the game and I've played about 10 matches or so.
Connection - The number one concern I had going into the game was the connection. So far I'd give it a 8/10. I've a few little hiccups, but nothing major at all. It was a moment of lag or whatever, never a full game or session. It's still early to say, but this is just a first impression. So far so good.
Maps - One of the things that can make or break a CoD game for me are the maps. I love that they've gone back to the traditional 3 lane maps. I've only played a handful of them so far, but I've enjoyed each of them. Some better than others, but I haven't had one that I hate yet. They all look good, play good, and the colors are decent enough. I hate the gray/tan look of some of the Ghosts maps. Like I said, I haven't played them all yet, but first impressions are good. 8/10.
Guns - I used a few during the Beta and I've only used 2 since release, but so far so good. They feel right and look good. There seems to be a decent selection. I haven't heard of anything being completely OP yet, so that's good. Early impressions, 8/10.
Perks - Still to early to say much on this. I haven't explored them all that much. However, I will say that I don't care for the Specialist stuff at all. I think it's just something extra added to the game that we could do without. I don't think it's game breaking, but I don't care for it. Time will tell I guess. 7/10.