We want your HALO 3 screenshots here. Add yours.
The Hushed Casket was founded in 2002 shortly after the launch of the XBOX console. Today the Hushed Casket is a thriving community of gamers, playing together and publishing news and stories that have appeared in major media properties like Newsweek, G4TV, USA Today, and Penny Arcade. Some game developers have even referenced our guides and news to support their gamers. We don't play Halo. We LAN Halo.

Get notified of game nights and important THX announcements via the hushedcasket Twitter account. You can get the messages on your cell phone, through email, Facebook, and many other ways. Here's how it goes down.
Auto-aim vs.
Auto-aim vs. sticky-ness...
I have noticed the difference between the two, but JayWhy puts it very well. In my review, I categorized it all as auto-aim, since either way it is being done for you.
I can deal w/ reticule sticky-ness, and it wasn't bad in H1, but having both stickyness and auto-aim at the same time, as in H2, just makes for a miserable experience. If H3 had gone the way of H1, w/ ONLY sticky-ness, and toned down auto-aim, that would have been fine, too.
I guess it all comes down to personal preference. H2 was more difficult for me, b/c in multiplayer, the sticky-ness (and auto-aim paired w/ it) made strafing very ineffective. In H3, even when someone shoots me first, I have more options. I can take cover, but if it's 1v1, I can turn, and more times than not, get a kill, b/c their reticule doesn't stay on me.
The grenades also feel better in H3 to me, much more so than H2.
BTW, I've been playing all 3 lately, to make comparisons. H1 on my PC (w/ an xbox controller, though, not mouse and keyboard), H2 and H3 on my 360. Playing H2 makes me suck at H1 and H3. But not the other way around. I can play H1 and H3 interchangeably and only notice negligible effects on aiming proficiency.