I went back and played PD and it wasn't that bad. I mean if you are a frame rate freak you could have switched it down to low rez which had a frame rate comparable to GE.
Having played the PC version which was a lousy port too, I would have to say it had it's moments. Really, it did. Like a sticky genade on an elite's crotch. But came second half of the game and everybody know what happened there. Also this so called weapon balance thing some one keeps bragging about, well it was an uneeded pain in the ass, that's assumming the weapons were balanced. Firing 60 rounds of anything at that velocity would have ripped any soft target to bits. Some assult rifle. Pistol is stronger. Disappearing shots from the shot gun. Why the shotgun Vs zombie thing? Why the past and cut levels? Why do humans have ineffective weaponry?
Halo in one sentance. "Halo was a good game, maybe even great, but it was flawed".