Mekabuser, interesting that you noticed that, too.
I was actually thinking about making up a thread about the exact same issue. Like Mekabuser, I noticed, that it seems to become more common for vets to bunch together right from the start and proceed to beat the living crap out of the other team, occasionally despite my please to even stuff out.
I'm playing for quite some time now and feel, that I can tell pretty well how a game will go, by looking at the names on the scoreboard at game start. So I'd suppose the other vets recognize it, too, when a game is prone to turn in to a stomp.
Don't want to call out names here, but yes, there seems to be a pattern with some guys, and yes, a few names on the list posted by Mek seem to ring a bell, but I didn't make up statistics...

Then there are other guys of course, who will switch in a blink, once they see games unbalanced, even before the first yell of "EVEN TEAMS, PLEASE!" comes through the chat. Spooky is one that I remember off hand, but there are others. I guess you know, who you are.
So it's not all bad, but yeah, it sucks more than it used to.