Personally, I'm not that much of a fan of MC or the games that feature him. I prefer the more story driven ODST and Halo Reach. I also really liked Halo Wars. I'm interested to see in what direction 343 will take this new MC featured game, if the story will be all over the place and only an after through like the first three games, or if like Reach and ODST it's a more focused and honed story driven experience.
That being said, I've always maintained that I like the Halo universe itself much more than the actual games. The games are fun, but there is still a lot they could do within the universe story wise. FUD goes a long way towards proving that and I'm pleased that it's turned out so well thus far.