I know the delay sucks and all but look at it this way.
Would you rather playing GTA IV with a few annoying bugs and a little frame rate problem, or would you like to play an improved GTA IV without so many bugs, smooth frame rate and most likely a slightly more graphical and gameplay enhanced GTA IV? The wait will be worth it when It comes to next years release.
Rockstar said GTA IV is improving as they go, I wonder what else would be done to the game while its delayed that wouldn't of been done if it were released in October.
Just think about, in the long run you're getting better than what you would've had if it was released tomorrow.