It's amazing how such a demanding game was able to run on the Xbox's hardware (733 MHz Intel Pentium III, 64 MB RAM and a 233 MHz nVidia NV2A). However, you can see that the FPS is pretty bad in some places and that the texture and model quality are incomparable to the PC version.

I've played through HL2 a few times, which is why I'm going faster than usual, screwing around, ect.