For all the GTA games I have played. (5/4/3/Vice City) I have to say GTA 4 is the least enjoyable. Mainly because of the Driving Mechanics, Not so memorable story and The police chases weren't that fun compared to the other games. The GTA 4 DLC episodes do not count as they aren't full fledged games.

Hard to say. I've only played Vice City, China Town, and 5.

All of them were good

GTA IV hands down. It was just boring and bland.

I've played small pieces of Vice City, GTA3, and GTA4. Didn't like any of them, will probably never play GTA again.

GTA III

Played 3, Vice City, 4 and Chinatown Wars and i consider 4 one of the worst games i have ever played

Same. Although 3 was more memorable for me because it was revolutionary. Doesn't hold up quite as well now though.

The PSP ones or 4. I don't know...4

The PS2 games were legendary for their time and SA is still unmatched content/fun wise. GTA4 was more fun to run around and blow shit up in... so I guess it's GTA5 for me.

I'm also inclined to agree, but I can't bring myself to say so since I love Niko Bellic so much.