Keep at it OP. Finish chapter 2. If you still don't like it, quit. The game doesn't change (I am into chapter 5 now and it's the same so far).
That said I thought the graphics on 360 were extremely good, certainly they are in chapter 5 with the jungle.
I can understand why some may dislike the game. I have never, ever played a game so much like playing a movie. The cut scenes are very long and there are a lot of them. I have also rarely played a game with such watchable ones, though. The voice acting is good, and the writing is pretty good, too. Lines like "I moved toward the sounds of life, snuffing it out as I went" make me laugh. Also it's rare you play a game and the main character considers himself a piece of sh*t.