Finished it last night as well and gotta say it's been too long since I had a great multi-hour session with some friends. Chasm has really grown on me - had a number of super tense CTF maps and it's so nice having dual snipes in play. I am loving Escalation Slayer- team did a great job IMO. Being down a few tiers and holding off the enemy team as they're charging with Oddballs and coming back to tie and then have a final showdown was exhilarating as hell.
Edit: I have been mixing up Escalation Slayer calling it Extraction for months. I blame old age.