I'll start with the positives:
I like the gameplay, I feel it is at a much faster pace than all of the other halo games
At first I was skeptical about aiming down sights with the SMG and AR but it can actually be quite helpful.
The graphics look amazing as well as the design for all of the guns (except for that energy sword thing, it's a bit to bright)
Both of the maps are pretty great
Negatives:
After an hour or two, those two maps tend to get pretty boring. At least one more map would have spiced things up
I am pretty disappointed in the ranking system, I really didn't like the SR ranking system too much but whatever.
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But overall I would say 343 did a pretty good job with the beta; i'm just hoping that they a good job with the game as a whole.