The point is a bit moot, in that TES got big on consoles as soon as Morrowind. Oblivion was already a console headliner.
I do think fewer people went with the PS3 version because people knew it was broken, just like Bayonetta or Red Dead Redemption. I would bet it still outsold the PC version at the time (that balance may have shifted over the years of re-releases and giveaways).