Well, I'd like to say we've gone back to slower servers, but we haven't. There is, however, a strong trend towards smaller, more intimate arenas. The speed settings from the larger arenas are generally being used, but the grids are smaller, so actual speeds aren't as high.
The fortress server has a cycle accel of 20 or 21, just under eggcozy's preferred setting. But cycle trails are only 400m, and with the low rubber, speeds rarely go over about 65. Even then, it seems like the useful playing range is around 30-40, with some particular positions generally being slow speed (the goalie plays at about minimum).
There's two things about it that you'll probably really get off on, though.

You have a stationary objective to take and one to defend. That's one thing. So while the old deathmatch team games had good possibilities for group play, you just can't play fortress without group tactics. You can't win it that way. The other thing is the team chat. If you start a message with "/team", then only your teammates can see it. Combined with instant chats and there's a lot more communication going on. Communication is essential to good group play, so it works.
The players there do get a bit cranky about a few things, and there are some that are sadly very kick-happy. Depending on when you go, you might want to thicken up your skin a little bit. After you get the basics (which you can get off the wiki anyway, but are also in the fortress thread), then you'll no doubt quickly become someone everybody wants on their team.
General abuse has dropped drastically. The server can now ban people for periods of time after certain kinds of abuse have been detected, and z-man just posted a little while ago that on the fortress server, the first time you're vote-kicked, you're banned for 20 minutes or so. You can't rip the grid anymore, and I haven't seen a player try to exploit a server in months. Basically, the script kiddies can't really attack a server anymore unless they do the same DOS-style stuff they used to do occasionally, but that never happened much and it seems to have dropped off a bit anyway. So it's definitely a safer grid than it used to be.
