Connection Issues
Matchmaking
Character Balance
Revenge Mode
AFK Farming
Other
Connection issues are bad, but the gameplay issues are my biggest concern.
I'd say the biggest problem is the defensive meta that is created by the fact that you can do free damage directly as a result of being defensive. Parry leading to damage is the biggest issue but dodge attacks are also slightly problematic. Deflects are much harder to do, so they may be alright, but people will perfect the timing and then they may be as much an issue.
If you could not get free damage directly as a result of defence, there would be no defensive meta.
More details here:
http://forums.ubi.com/showthread.php...ce-suggestions