I can't imagine playing Halo, Period.
I played Tribes and Tribes2, so Halo just seems lame in comparison.
In fact, the BEST game of that type (3D squad combat, powered battle armor) was "Terra Nova: Strike Force Centauri", by Looking Glass.
Sadly, Looking Glass was a little too forward thinking, and made games that ran lousy on current hardware but GREAT 2 years after release.
As for the P3 vs. Celeron... it's a P3, true. But it's a P3 on a crippled bus, with shared bandwidth for all the devices and no dedicated CPU lines. Lop off some cache and it's a celeron. Might as well be, runs like one.
And the reason the Genesis emulator runs better on the XBox? Because it's a byte-for-byte port of the PC Genesis emulator which is older, better supported, and more refined.
I've seen some impressive graphics coming out of the XBox. But that's about all.
- Gurm