I am also really enjoying this game, I am on Chapter 6 of the Standard game so far.
The tutorial option is a must before playing even though I haven't used some of the techniques they demo'ed, probably need em for the harder skill levels.
Control system is pretty intuitive. Movement is very relastic, you soon learn about 'FRIENDLY FIRE' if you don't pay attention.
The Comabt Actions are where this game is at its best, Grenades, air strikes, fire fights, flanking manouvers. Even though you can't resist putting the team in harms way of a RPG, at least once, just to see what happens
The team banter is, as previously noted, top notch. There are some especially good lines when you revive some wounded team mates at a CASEVAC.
Still waiting on Royal Mail to deliver my 15 foot CAT5 cable so I can use my X-Box Live.
Best game I have on x-bob since the original HALO.