I'll throw down on it, conditionally. If it is as horrible of a port as GTA4 was, I'll skip it without a second thought.
Bought GTA 4 and the Episodes for something like ten bucks on Steam. Had I bought it at full retail, I'd have been quite annoyed. Entirely unplayable on higher-end hardware that didn't even exist when the game launched. I suppose that unplayable is a subjective term, but it certainly met my definition.