I went hands-on with the beta for a stupid amount of time this past weekend. I walked away pretty impressed, but I also think the game has issues - unlimited sprint being my main problem.
It upsets Halo's pacing and makes the game feel more like Call of Duty than what I see Halo being. Anyway, I put together my thoughts in a recent story and thought you might be interested in checking them out.
Let me know what you think.