Least they could do was fix the prompts to properly reflect the bindings.
At this point, it's not so much that the controls are so bad as to be game-breaking, but more that I'm so annoyed at the poorly designed control scheme that my interest in the game is, sadly, on the verge of evaporating.
I think they tried to make the mouse more useful on its own, but in the process, they just broke it. Because of the delay, anything that requires precise timing (which is just about everything in Dark Souls) is just ridiculously difficult. I should be able to steamroll the first area of the Forest by now, but I run out of all my Estus every single time just trying to get between the first two bonfires—the delay in blocking means I always end up getting hit, and the glitchy combos mean I don't make necessarily effective attacks. You end up having to play a half-second ahead of the action, and when you go in to attack, it's anyone's guess how the fight's going to end (it's hard to maintain stamina when a single click too soon will launch you into a costly power attack, and blocking mid-attack is horribly ineffective unless you can break away from the enemy far enough to compensate for the input delay). I've run into trash mobs that should be easily dispatched without taking a single hit, but with keyboard and mouse, I can come away from these fights wounded almost to death.
I don't know what the solution is going to be (if there will even be one). The double-click behavior is just breaking everything, and I'm not sure they're going to be amenable to removing it.

Honestly, I always felt the keyboard commands were fine. They got ruined too (the mouse wants exclusive access to the Shift and Control keys, so it's not even a great solution to try reverting the controls to how they were set up in the first game), but not so much as to make the game that much more difficult. With a bit of practice, I don't see it being a long-term issue. The Xbox button prompts are embarrassing (and people are right to point it out as a flaw), but once you learn the equivalent keys, they're easy enough to ignore. I'm not sure, though, what specific actions you're having trouble with?
And the good news is that the game seems to run fine (if you can get it to launch, I guess). I still wish they had been able to make all the light sources cast shadows in the PC version (the change to ambient lighting never bothered me, but having all the lights around that don't cast any shadows feels unnecessarily rough), but the visuals are decent and the framerate increase makes everything look even better.
I don't think it was as good as the original, but it's still an above-average game. I just wish it could be played correctly sitting at my desk with a mouse and keyboard.