At the risk of annoying my PC playing brothers, I'd have to say that anyone calling the Halo series sub-par in it's xbox incarnation is a bad consumer, probably spending his money on bad products and encouraging a bad industry trend for the release of crap. (Which the PC port might be... the PC port of the original was definately inferior, just like PC games ported to consoles usualy are and for the same reasons. It's not what they were originally designed for)
Hate it for any number of reasons, but not the control or execution of what it is or the fact it's on a console, thats weak. It's not my fault you are too unco-ordinated or old to adapt.
Halo seemed derivitive to me... for about 20 minutes. The action component of this now ancient game is more thrilling than any so called A-grade PC fps I've played since, and I've played most. Half Life 2 is the only product to excede it and it's sequel in terms of atmosphere, but in terms of art direction nothing comes close to either game (Which, like WOW, rises above the low texture/polygon counts to create something far more beautiful than the glorified unplayable tech demos on store shelves today).
I got on the bungie bandwagon around the time of Myth's release, look it up if you don't know it, and I've learned release after release that the fanatacism around their products is not just a throwback to their mac developer days, these guys do quality. Bigtime. I don't know what their secret is, as they've maintained it through multiple platfroms, a decent turnover of talent and a buyout by M$, which has been smart enough to let them do what needs doing (A lesson some of the other big publishers are only now starting to learn).
PC games can do more, but they have squandered it. RTS interfaces are screwed up, not enough develpers played Total Annihilation or Myth and continue to throw unwieldly crap at us. I love Total War and Rise of Nations but there are basic problems with their interfaces that I find totally frustrating... something that never happens to me in Halo2 (A focus on UI is a bungie hallmark... do other developers ever spend more than a day on this? I know bullfrog/lionhead are innovators here, but not all their risks seem to pay off).
I'd rather play through Halo 2 again 10 more times than Half Life 2 for a third, despite it's mouse control, silky smooth framerates and high resolution graphics. A game needs to make you forget it's game, and this only happens when the controls are so sweet you don't have to think about them. Bring on Bungie's next FPS/RTS/MMORPG or whatever please.