Getting offtopic, I guess...
orcishgamer: If you thought Halo 2 was hard on Legendary you should try Reach, where even the lowliest of enemy can throw grenades like a pitching machine.
BTW, did you finish Halo 2 (XBox) on Legendary? I presume it can be done, otherwise there wouldn't be those Youtube videos. :)
So it seems Halo series gets progressively harder with each iteration, right? Pretty much the first thing I noticed in the original Halo (compared to Halo 2, both on Legendary) that I'm very rarely, if ever, even close to running out of ammo. Heck, even my basic assault rifle can carry 600 rounds, compared to something like 130 in the sequel. Same with the handgun.
Replenishing your ammo in Halo 2 seems to be a problem in many parts too, because I can't get to the downed enemies (and their weapons) until I've killed pretty much all of them in the area. They usually just hang around in the same spot, waiting for my move (at least in those parts where I am now having a problem, in other parts they seemed to move around more, hence they were easier to get one by one.)
Plus, all the weapons and grenades seem much more potent in Halo 1. In Halo 1, one plasma grenade seems to be able to kill two elites at a time, if it blows up close enough to them. That would never happen in Halo 2, there a precise sticky seems to be the only way to kill even one.
The enemies also seem to detect and actively avoid the grenades in Halo 2, much more so than in 1, lessening the usability of the grens even further. And they shoot much more aggressively (rapid fire) too.
I dunno, maybe I should really restart Halo 2 on lower difficulty... or buy the PC version, I see some shops still selling it...
(God I had completely forgotten the copy&paste maps in some parts of the first Halo, I'm not sure if I have endurance to go through them again... I was actually enjoying the second playthrough quite a bit, until those levels.)