spindown: The way you describe GTA IV makes me think that you have barely played the game at all.
I played the first chapter very thoroughly (done every side quest, visited every location, etc.). This left me with a feeling of utter disgust. I looked a bit into the second chapter to see if the promised "mature story" would surface at some point, but it didn't look that way. I then watched some gameplay videos about the later chapter to see if I was missing something, but the content seemed very similar to what I was experiencing already.
If there is something in the latter chapters that turns this around, then I may indeed have missed it - so that's definitely a valid criticism to my statements, though I would ask to not simply dismiss them on grounds of "didn't play the whole game", I think that would be a bit too easy. However, these hidden contents would then have to be something which for some reason eluded not only the gameplay of the entire first chapter (and parts of the second), but also all the videos that I watched. Most of those deal with rampant killing sprees and car stunts, even when they are about the late game. You say that there are repercussions for the player's actions - does he ever grow _not_ able to do the things I mentioned above (stealing cars under the nose of the police, rampant killing sprees that are forgotten when the police loses sight of you for a minute)?
spindown: GTA IV is a bitter satire of the American dream - it is about a man leaving behind a brutal war and coming to America in hope of a better life, only to be find himself surrounded by violence once again.
He's not looking for a better life, he's looking for revenge (another not very mature concept, but one that's admittedly a staple of storytelling especially in action-based settings).
spindown: The lack of choice that you complain about is simply necessary because the game is trying to tell a story. Making a game that gives you actual freedom and builds a dynamic, meaningful story around your choices is simply not possible with today's technology, so criticizing GTA for not doing that seems pretty naive.
Well ... on a theoretical level what you're saying makes sense, but I have difficulties relating it to the actual scenes in the game. Is it really so necessary that you shoot a man in the knee instead of giving a warning shot first? Is it really so necessary to kill a defenseless man? Was it not possible to send him to another city (the game provides an excuse this, but it's terribly lame and hypocritical). Even if the guy _has_ to end up dead to facilitate the rest of the intended story, would it really be impossible to tell the story if he had died with a weapon in his hand?