What John is talking about (R2) is VATS. Strategic targeting system that allows you to set up shots and get a bullet-time style playback of your attack. Good fun really, and IMHO, never gets old.

I just beat Fable II, Lost Odyssey, and Infinite Undiscovery so I am gonna get cranking on Fallout 3 now to get myself some achievements. If you play on 360, my tag is "VXSS". Just started playing it last night and made my character "Obama", who has a very decent resemblance, heh. Saving the world, one mutant at a time!