I played SotC for the first time on PS3 and I too found it to be lacking. I actually preferred Ico because while it was less ambitious, I felt it was better able to execute its goals. I agree that the controls are not great and the whole shaking mechanic is just broken (literally in my case because I've read a lot of people say that the PS3 version was borked, which should have been fixed for the PS4 version). Overall, I found that the collosi mostly just get more tedious as time goes on, not really any more interesting and the story comes to a limp conclusion with what I found to be a tremendously disappointing finale. I disagree wholeheartedly with people who say that it is one of the best in video game history.
That said, I did beat the game and I don't really regret my time with it. While it never got much better, I think it was still interesting to play through just because of how huge the game is in video game culture. I am also the type of person who tries to beat every game I play, but if you don't feel compelled to play more, I would say that there isn't anything that will change your mind throughout the game.