In the multiplayer I've experienced a quite annoying "bug". When going for a stealth kill, it will say "CLICK R3 FOR STEALTH KILL" and if an enemy is in motion, it will follow the enemy with just a blank HUD. The only way I can get out of it is if I repeatedly click R3, causing me to melee, which more often than not misses, and ends up getting me killed. Anyone else having this problem?

tap it for quick me-lee hold it for heavy me-lee.

The only bug with melee Ive had was that when i tried doing a stealth kill on a moving ceph it would first punch him then do the stealth kill animation

That happened to me as well in the campaign, but I do like to sneak around and get stealth kills a lot, and this has been so frustrating!