I'm still working on getting my way through Halo 2. I'm sure they've made a lot of modifications in 3, so skipping from the first to the latest may male the game feel a lot more different than if you really gave 2 a go first. Plus the storyline continues - completes, as I understand it - and so if you skip 2 and are playing 3 and get the feeling you're missing something, that'd probably be why...
I'm a Halo lover, but I don't get to play it very much, and I'm not very good at it, so I'm still probably not the best person to ask these things. =P
Yeah, I feel like there's no more point in hanging around. I've been here for awhile and never once went anonymous or was gray for more than a couple of days, so. Why not, right? I totally don't want to fund Nazi-child-rape-porn, anymore, and shit.