I am so glad I kept my pre-order and got the game, especially after nearly cancelling it from reading the posts on the forum.

I had some slow frame rates with my old GTX 660, but I put my GTX970 Gamer edition card in this morning, and started playing.
I played for most of the day now, and the graphics are flawless, and cut scenes are smooth as silk.
The game has not crashed once on me, and I have had no other issues.

My game updated twice, once after installation last night and then this morning before I played for the first time.

I certainly hope that most of the problems people are experiencing is sorted with patch 2, and I am having a completely different experience
to what I had with Black Flag, which I am very thankful for.

My Rig:

Intel Core i7 4790 3.6Ghz (4th Gen)
Gigabyte Z97X series mainboard
16 GB RAM 1600Mhz
GTX 970 4GB
Win 8.1 64bit Enterprise