Many? All I see is either you, SonOfLiberty or Xstingray, and ocassionaly some random joe that never appears again.
I take it you don't visit the GTA IV forum very much then.
To be fair, the complaints towards GTA IV were legitimate (no planes, awful vehicle variety, annoying phone calls, no customization, etc), but the complaints towards GTA V are just stupid (these complaints mainly come from the San Andreas fans however, most, but not all, GTA IV fans are story whores and talk about nothing but the story).
To be fair:
Planes are not a legit complaint. We do not know how much of that coding is finished. All plane code proves is that they were working on it.
Vehicle variety is not a legit complaint. They were developing the basics for the vehicles, so creating a lot of unique vehicles would not be the biggest priority.
Annoying phone calls are a legit complaint. This is a system that was in the game and was not great. It's fairly inconsistent and should be improved.
No customization is a lie and not a legit complaint. Niko did have clothes to buy. It wasn't much but there was customization.
No car customization is a legit complaint. We can respray cars so why can't we at least pick the color? We don't need full customization but a little would have been nice.
GTA IV started with nothing. I don't see why you make me repeat this so often. It is equivalent to GTA III in that both started with nothing. Both used new engines, both used new gameplay, both were on new consoles that Rockstar could not fully understand. GTA III is not special just because it came out in 2001 and GTA IV in 2008. III could have been another top-down game if Rockstar had wanted, so it's not like this is the first time they have reinvented GTA. Starting over is starting over.
On the other hand, GTA V was developed on consoles Rockstar had been using for years, on an engine Rockstar were pretty much familiar with and had made several games for, borrowing gameplay from various Rockstar titles and tweaking the gameplay that had already been done while introducing very little unique gameplay. Most of what it introduced came from other games or was very lackluster.
Call it an 'excuse' all you want, it's an important factor when comparing the games. I'd say the complaints about V are more fair than the ones about IV.