Is the Halo franchise really all that terrible? I don't know - I find a lot of people slam on Halo just for the heck of it. I've always found the games pretty engaging and fun to play. There's a reason they sell so well. I don't mind that they keep putting out new chapters and releases because I always want to see what's going to happen next in the story.
Then again, I'm also one of those rare players who's only in it for the singleplayer / co-op and avoids the competitive multiplayer like the plague - maybe that's where the franchise gets a lot of it's bad rap from?
Edit: Either way I'm looking forward to seeing how this develops - at the least Bungie's games always have a ton of refinement behind them, co-op play (for the most part) and tend to align with my own particular favored genres and settings. Even if this turns out to be "just another shooter", I'll probably still play it for these reasons alone.