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It is my favourite in certain aspects. I think Niko is one of the best characters Rockstar has created and the storyline had a great darker tone. I think the older 3D Era GTA games have a bit more reply value and were more of a playground. GTA IV was a more realistic and grounded approach, and it did a good job at branching out.
GTA IV definitely gets my vote here. I don't really enjoy the flight Star Wars games.