Finally got to play tonight and didn't stop for 3 hours, which is quite a long time for me. I was able to rank up to 12 or 13 in that time. Matches are quick, spawning is quick....it feels like you're just going going going, all the time. Tonight was also the first time I've partied up on the X1 (I've had it since launch but didn't have any close friends who did). Voice quality is really good, I was impressed with it. A friend who just got his console today was extremely surprised with the voice quality, too.
I'm typically middle of the pack when it comes to randoms. I like the bots because I typically kill more of them than anybody else on my team, but they often distract me from the actual players running around. I'm getting better at watching my mini-map though, since it differentiates between the two. Most everyone is shooting all the time, so it's really easy to see who is where.
Maps are great, I haven't really had any complaints. Just need to learn them. I'm not even using the wall-running all that much to be honest. I'm not really seeing the lines throughout the maps although I'm sure they're there.