After one night of playing Titanfall, there are a couple of glaringly-annoying things on the One, in my opinion:
1. If you don't use the Kinect, it won't log you in automatically. They need to add back the 360 functionality of having a "default" profile. I mean, mine if the ONLY profile on the console, yet I have to tell it to log me in every time. It's not a long process, but it's a process I'd rather avoid.
2. I wish they had a Task Manager or something. I don't like backing out of something, only to end up back in an app/setting I was in 2 hours before, but didn't want left open.
On the other hand, I really like the controller. Most of it's just fine as it is, but I don't think that anything's worse (maybe the feel of the Home button is a bit worse than the feel of the 360's Guide button). However, I REALLY like the new sticks, and how they have almost no tension. It makes the small movements a lot smoother, IMO.