So I've watched #1 and #2. Tonally, it's very different to the typical Halo yarn. It's not comedic at all. Which isn't to say its bad. Not all Halo has been. It takes some of the core elements of Halo - civvie vs government, genocide and Alien tech - and spins a serious story with it.
Character-wise, not too many are shining after 2 episodes. Aiken, Locke and Macer are standing out at the minute and I think they'll continue to be the more prominent characters. I look forward to seeing more of them all. I liked the inclusion of Aiken as he had very little in the EU. Exploring the post-Spartan life should be fun!
Story-wise it's moving very slowly. Which can be good - if it builds to somewhere worth going. We'll see.