Nintendo, one of the most vociferously anti-piracy dev/pubs I've ever seen,
recently had one of their higher-ups say that piracy should not be the sole reason blamed when a game does badly. He doesn't ignore it, because frankly you can't... on
any platform... but he basically admits that if a game is crap, it ain't gonna sell well.
And basically, PC gamers are used to good games. RTS, TBS, RPG, Flight sim, management games, space sim... ten, fifteen years ago, the PC was where you developed if you wanted a "big" game. Consoles didn't have the "mature" market. They had arcade racers, sports games, JRPGs, platformers, tetris-clones... but no RTS/TBS or more complex games. It wasn't too many years ago when FPS on a console would have had reviewers writing "what were the devs thinking/smoking when they came up with this?"
As consoles have evolved, time has passed. Consoles have got better, a new generation has grown up with them in their rooms from young ages. Analogue sticks on controllers opened up the possibility of finer control in games (although still not up to KB+M standards) people have played these games this way from the start, and not known differently. Going from controlling a game via a KB+M to a controller, especially in games which require finer control like FPS/RTS games is a horrible experience (in my opinion, of course). I can't grasp FPS gaming on a controller.
So... I digress. Anyway. PC gamers are, by and large, used to quality. When PC gamers find a game that grabs them, they can keep playing it for
years (see: Starcraft, Warcraft, Counterstrike, Half-Life, Quake, Doom, various Point 'n' Click adventures, Baldur's Gate, Planescape: Torment, Civilization, Simcity, 'X' games, I-War 2, Star Wars space combat sims, Freespace, Morrowind, C&C, Grand Prix 4, 'Tycoon' games) and are inherently more hostile toward rehashes of 'same game updated season' methods.
That and games on the PC have a major disadvantage for publishers: it's easier to mod a game on the PC. If the devs release some tools, that makes it easy, and the fan community then proceeds to go mad and make so many free mods that people could keep playing for the next ten years without needing to do more than download mods for one game. And even if the devs don't release mod tools, if a game gets popular enough, the community makes their own... in some cases falling back to the very software that the devs used to create the game if it's commercial (eg: Final Fantasy VII PC has a heck of a lot of mods to improve one thing or another... and it's taken a heck of a lot of effort to get there...)
Publishers don't like the PC not just for piracy, but because of mods. Mods mean they can't package up a few new skins and maybe a new map or two and sell it (see: Activision and CoD:MW2) they
can do that on a console as it's a closed system.
Oddly, one of my bigger complaints at the minute is that developers seem to be getting sloppy. Or lazy. Or God knows what... because with the exception of a few games (Just Cause 2 - which is
much better on the PC, Cross Edge, Crisis Core, Persona 3/4, The Witcher...) I've found most of the ones I've played in recent years eminently forgettable. They're fun while they're new, but just don't grip me on a replay... Oblivion, Dragon Age, Fallout 3, Mass Effect, C&C3, Final Fantasy XII, FF XIII, Assassin's Creed, Resident Evil 5, every FPS I've played since F.E.A.R...