Yes, the last quarter isn't as strong as the rest of the game, but those three quarters are some of the best game I've ever played. The story uses the medium and the players expectations so expertly that it manages to create some of the most unforgettable moments in any game. Combat wise it's still good, although the sequel does trump it in this regard. I think that's enough said, everything I could say has already been said, so what are you still doing reading this review; just buy it.
This is one of the most emotionally resonent 'games' I have ever played. The sheer creativity is astounding. Every story is presented in a way that is touching, engaging and intriguing. Truly a phenomenal experience that I'll remember for quite a while. It is a little short though, but I promise this is something you want to try out.