I'm sure he's referring to the fact that previous GTA releases on the PC have been largely unimpressive in terms of optimizations. GTA IV at launch was -horrible-... if felt like playing the most graphically-impressive game on the market, and then it look like GTA IV...
We're just suckers for putting up with it. If my 360 didn't RRoD a few months ago, I'd probably pick it up for that console, and will definitely pick it up for PC whenever that drops. Rockstar hates the PC, that much is clear... it just happens to have the benefit of making us forget about it by releasing epic games.