Will you look at that, there's actually a Tribes 2 demo out. Demo featuring "two single-player training missions to get you started, a CTF (Capture the Flag) map, and a Team Hunters map". It's a 80mb download from Sierra, or you can try Fileplanet.
"Are there demo servers?" tut tut :P
the bots are dumb, they suck. basicly only good for DM
no, that version came out two patches ago. it's just gotten better since then