I'm not saying Halo 3 is good or not because i haven't played past the first level. But at the same time it is the only game (apart from Viva Pinata) of the 10 games that i own on the XBox 360 that i just cannot be bothered to play. I don't know what it is about it, but it just doesn't capture my imagination or pull me into playing it. I got 2/3 through Halo 1 on the PC too, but gave up due to it's repetitive level design. It's such a shame - i don't hate it and i want to love it, but i just can't!
P.S. To put my Halo 3 plight into perspective, i even forced myself through to the end of Assassin's Creed after playing the first level of Halo 3, and still didn't return to it!
I liked the first one (of both them!) too. Took the PS1 (the big one) on holiday and before the laser broke we racked up hours on Driver and Tony Hawks 1. Poor thing
My Dreamcast broke only a few months after I got it when I played Marvel vs Capcom for 8 hours straight. Can't stand that game now though. I wonder why