Necrobump I know, but I'm LTTP on this game and found this thread.
I guess BioWare patched the PC controls sometime after launch or after this thread was made, but after just now trying the game out I don't think the MKB controls are unplayable, just a gigantic disappointment compared to the previous two DA games. Yes, even Dragon Age 2. But in their current state I actually still prefer the MKB controls over the gamepad controls.
At first I found BioWare's decision to have A and D turn the character instead of strafe to be baffling but I just changed the key bindings. Apparently you couldn't do that at launch? With a few other changes the controls became acceptable for me. I prefer MKB to gamepad because a lot of things like the map, inventory, and equipment are accessible either through keys or icons on the HUD, as opposed to going through the pause menu on gamepad. The real issue is just that tactical mode feels pretty useless on MKB. BioWare later let you zoom out farther but just like DA2, it's still nowhere near the isometric mode the PC version of Origins had.
Game so far overall is okay, but chock full of the most mindless style of fetch quest design. I can see why people were blown away by Witcher 3 after playing this. It's not even the same ballpark.