Copy paste answer from my last post in another KB+M =/= Controller thread.
My personal irk with a game that supports Controllers and KB+M is this.
Skyrim is my prime example, there are so many things I wish I could do in it that aren't an options because of the limitation of a controller. EG button mapping limitations.
I want to play as a Gandalf-esq character, which in Skyrim in all its forms including modded is so far impossible.
What I wish I could do is have my Staff and Sword in hand and it works base like dual wield but the staff has no power attack, holding blocks\deflects but push BOTH buttons and it's a combo swing like Gandalf did on the walls of Minas Tirth. With using the staffs ability *Fire ball, frost, lighting, etc* With a dedicated CAST button like Oblivion had for magick, but it's only for staff.
Above example, perfectly doable on KB+M, I'm not sure how they'd do it on a controller.
So for that reason, I cringe internally when I see a game say *Controller supported* Because the first thing that springs to my mind is simplified controls and lack of real options in gameplay.
But I'll never attack someone over it, that's just my personal pet peeve. The people that attacked you are... Unmentionables.
:EDIT FOR CLAIRITY:
That was just one example mind you, I'll use my controller and love every minuet of it in stuff like NFS, Driver SF, and Flight Sims... KB+M on anything that is simulating an analog input is... Unpleasant to say the least.
Oblivion did it, though not in the same way. You could have a touch based spell equipped in the same hand as a sword and use the cast magicka key to use the spell without sheathing the sword, so you could use like a drain life spell while the other guy was guarding against a physical attack, and then swing with the mouse key.
The Gandalf example was just a personal gameplay wish haha. My example was meant to be a template for "Multiple uses of X limited by key bindings*