I don't agree with that, I think it had more serious elements than comedic ones. At it's core, from the very first introduction to the Belic cousins, we see that Niko has got a lot of demons and that he's not so much starting a new life but running from an old one.. That sold a real and 3D character to me and it didn't feel in anyway like a comedy premise. Like most Rockstar games, it's a character based stories and most characters have shades of many things so there is room for both comedy and drama.