Shep, maybe you have labelled this thread as "Why "Arcade-Style" FPS game enthusiasts do not want MAG" because honestly, that is what seemingly this is all about.
1.) You make judgements on a BETA version of a game, but this has been gone over many times, so I won't touch it except this. You barely, if at all, know the full game. So any judgements you have on the actual gameplay and experience, is pretty much invalid, because what your experience and gameplay is of a version that no longer exists.
2.) Why is it just XBOX gamers? I know lots of XBOX gamers that are, I wouldn't say jealous, too strong a word, but are definitely impressed by what I've shown them of MAG, and wish it could come out on XBOX. That's why your thread title is misleading.
3.) You like smaller teams, this and that, that's fine. The experiece is much different though in MAG then MW2. The only game that comes close may be the large Halo3 maps that could hold...correct me if I'm wrong, 24 people? Or that one game's 30 on 30 is the closest. MAG is meant to be massive, because it takes a TRUE team coordination to complete the game. 1 person can not dominate. Heck, 4-8 people could not dominate a match...well, it might be possible, but very very improbable. The point is, unlike these other "tactical games", MAG is about the big effect. You need strong leadership and guidance to guide the lower ranks to complete objectives. That's a very new concept in these games to actually give a ranking to the players in a match, which creates a command structure. When I first started playing, I played one match trying to do things on my own. Now I try to follow what my squad, the squad leader, and the higher rank people say, because they have a plan. They've seen tactics before, not just individual tactics, or small group tactics, but TEAM tactics on a scale never seen before. On top of that, the game really emphasizes on specializing in ONE thing early in your progress, so that you can become good in something and be effective in combat situation, and not just cannon fodder (though you will be to an extent for the first matchs until you gain more experience, and therefore, class upgrades).
It's a very unique game, and truely something groundbreaking. In a few years, it might not be the best in it's class, but right now it's the ONLY game in it's class and when comparing to other games, a lot of people find it more fun because one person can not dominate a match, and neither can one person frick it up.
When it comes to battlefield simulation, MAG owns right now. MW2 is just like other games with similar setups. It's an "arcade" FPS. MAG is the closest thing to a "war-simulation" FPS.