There've been articles about it.
When you use higher resolution textures than recommended, you gonna have loading freezes, supposed to be tiny, when using the normal textures. They wrote it's easily playable and barely noticeable.
When they used the HD pack, the freezes became unbearable. They then used some Titan or whatever card that actually has 6GB VRAM and offered comparison screens between High and HD textures... Well, I couldn't make out any difference and they wrote neither could they.
Not gonna bother trying. It looks nice to me even on Medium textures but I gonna at least try High textures at some point.
And it's a fun game so far. Combat is really fluid and has a nice Oomph! to it. Finishers indeed look cool. Animations and presentation is top, I'd say.
Can't say much about the story so far cuz I haven't played that far into it. I get distracted from those Side Quest shinies along the way
What I noticed is that climbing and parcour works better than in AC. it seems. It's less holding a button and more pressing it once to initiate the climbing. Maybe it becomes different later on but for now it seems more practical.
Oww, and it runs great for me. Everything maxed out, benchmark gives me a solid 45fps average. Good enough for me.