Good to hear from you...is your review up yet?
It's up, but it's in Dutch. I've got a review ready for the Halo lore thread, but it mostly focuses on the story and only briefly touches upon the gameplay.
Simply put, I think it tells a great story. Completely different in tone than what the marketing suggested. First half of the game gave me a legit ODST-vibe, as you're uncovering the mystery. Then everything kicks into overdrive. As I was watching the ending events unfurl, the feeling it gave me reminded me of the feeling I got at the end of The Empire Strikes Back.
Gameplay-wise the campaign it feels really close to what we got in Halo 3 and, more particularly, Halo 2. Some of the areas you encounter really look and feel like they were inspired by that game. Obviously you now have the ability to thrust, clamber and sprint, but this is the first time I've felt additions like this don't detract from the experience. These are not armor abilities you switch out, these are abilities you always have at your disposal and they feel great. Really add another new layer to the combat and the exploration. I've spent hours just climbing on top of structures, looking for audio logs and skulls.