Yeah I bought this along with Halo 3 because ET was so cheap! It's a really good game, but I've sort of given-up playing with the bots - it's just way too hard to ever win a match! (your fellow bots really aren't up to scratch).
Also I was *really* disappointed at the guns. They look amazing, but the sound effects (and hit damage) just feels really weedy. I'm not a big fan of the fact it only takes the slightest shot to kill you either.
The vehicles are cool
(the Strogg have the best ones though!)
I think if you can get into an online match, with GOOD players who work in a team, it's a blast - but if you get stuck with a load of Rambos you don't stand a chance.
Never trust a computer you can't throw out of a window