Played the SP for about 2 hours. Got to the mission where I have to go to two different places to destroy two things (keeping it vague, spoilers, whatevs).
This is an odd game. You can see where 343 is trying to branch out, trying to do something different, trying to move this series forward.
Then literally in the next breath you're back to where you've been before. Doing the same things you're always doing.
I like the way the game looks (for the most part). I like what they're doing with the Cortana/Chief storyline. I think the new enemies offer a new welcome challenge.
Where this overall story is going, we'll see. It's playing too safe for me to really get fully invested so far.