A frustration I have is lag.
Sometimes I'm playing a match and when anything happens, especially explosions but moving the view in to shoot also, and little hangs from a half second to a few seconds will happen. When it does I'll check the game's claims and my fps might be 50fps or 75fps, and ping is usually 25fps.
Rarely during the hangs those numbers get bad, but not usually.
I suspect it might have something to do with my PC slowing for disk activity, but not sure how to fix that short of buying a bigger SSD and putting it on that.
It doesn't always happen, but it's frequent enough. Rebooting seems to help.
It might be related to another issue, that just after my PC has been running a while I can see similar delays in Rift sometimes, load times get much longer, etc.