I skipped lunch and ran home to play the beta instead, and I managed to get three quick games in. And remember, I'm probably the biggest, most biased Halo apologist/fanboy on these boards. But...
Oh my god.
It's SO fucking good. Even in just thirty minutes of gameplay, it just feels great. Everything has a little more weight, closer to the original game than Halo 2's floaty physics. But it also retains the sequel's frantic pace, so it's the best of both worlds.
Other stuff:
--Dual-wielding is no longer necessary. Thank Christ. I stuck with the assault rifle for the most part, and I already love it.
--The Spartan Laser, gravity lifts, spike grenades and detachable chain guns are all awesome. The laser in particular is great fun...watching players scramble away from the Predator-ish laser-sight while the weapon charges up never gets old.
--The man cannon is cool, even though it doesn't fire you quite as high or as far as I'd hoped. I did manage to drive a Warthog through the cannon though, and corkscrewing wildly above the map while my gunner sprayed bullets in every direction was the high point of my session.
I played Team Slayer on Valhalla and Slayer and Crazy King on Higher Ground. Crazy King is actually kind of fun again, since the ring of icons has been transformed into a circular wall of light...and once you're inside the circle, you can barely see through the light. Which means you're constantly pivoting from side to side, waiting for someone to rush out of the light.
Anyway, it's good. Really good. And I don't want to be at work right now.