This problem has started since the last patch. I am surprised nobody has mentioned it, although explorer classes went out of fashion years ago so maybe I am the only one who has even noticed it, especially if it is only affecting heroes.
Anyway, I was starting to get a bit irritated by the fact that attacks, jumps, rush, slipstream, and using potions weren't always registering like they should, and my character was just clumsier, and my attacks at bosses seemed slower than usual. At first I thought maybe my computer was just being weird and I just tolerated it.
Upon closer inspection, I noticed that my character is doing this awful inefficient final attack thing roughly half the time after I use raging blow or rush. She swings her sword again, hitting one monster with pathetic damage. It's like the final attack that follows power strike.
It's really annoying, because once I have finished using rush, I want to follow it immediately with a strong raging blow attack rather than waiting for my character to do some pathetic damage on one monster I used rush on, while in the mean time all the monsters attack me when I could have killed them before they could attack me if I could have done my strong attack straight away. It also brings down my DPS at bosses and training in general even when I don't use rush, as I can't using raging blow as quickly because it also has a chance of being followed by this weak final attack.
It never did this before the patch. And I am sure it is a bug, because of the problems it causes, such as lowering DPS. But like I said, I am surprised I am the first person to even comment on it.