I like it a lot. I haven't played it lately cause my free time is still tied up with Diablo 2

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It was kinda a flop though. It got some bad reviews, had some major crashing bugs, ran slow on most comps. It's better now, but I've never had it crash much ever. Sierra sucks though. Them and EA are suck.
I spent so much time playing Shifter Tribes 1. That was friggin amazin. Fun as hell all the time. When I do/did play T2, I played Shifter. Not quite as fun as Shifter T1, but still a lot of fun nonetheless.
If you've never played Tribes before, it will probably seem confusing cause you gotta select your class and weapons loadout (I still prefer the old menu at the inv station), and if you want to pick turrets or whatever to place. But its an awesome team game because everyone will (hopefully) be playing different roles like pilotings, flag defense, base defense, capture flag, sniping, etc...
But for how cheap the game is now, I'd definitely pick it up if you got the computer to run it and are interested in a team-based, outdoor type game.