Honestly, I'm not so sure about that. Everything about GTAIV except the technology behind it rubbed me the wrong way. I didn't like the characters and I think they took themselves too seriously in the writing compared to the previous games. The gameplay also felt like it took several steps backwards with the city feeling smaller than things had been in a while, with less to see and do, and the god awful addition of maintaining relationships and being bothered by someone every five minutes to go bowling or play pool, or some other half assed mini game that wasn't enjoyable at all.
The whole thing really didn't feel like a GTA game to me. It felt like a game trying to be a GTA game but forgetting that they were usually pretty over the top and a lot of fun because of it.