I believe I stopped playing TMX (TM PS3) online around 6 months after it came out. So I'm not very familiar with who still plays it these days. Although I believe
@Muddeh still plays it. Maybe he'd be in a better position to comment.
As far as TMBO goes, a small community of TMA players still regularly play it online to this day. We usually play late on Saturday nights (between around ~11:30 PM to ~2:00 AM EST). Our Saturday night group usually plays Last Man Standing (LMS) with teams and special rules (most notably - no healths and no Env attacks). TMBO doesn't technically support teams, so we memorize our team mates and try to avoid attacking them.
TMBO game rooms support up to 8 players. We usually have anywhere from 6-8 players. On rare occasions we might have enough players to warrant creating 2 separate rooms. Smaller groups of players may play on other days as well.
If you're interested, I'd recommend visiting the
TMBO revival server website and checking the PM I'm about to send you. Some of the
TMB board's threads might also be of interest.