I was intrigued with this game from the first time I heard about it. However, it could be another case of love or hate for me based on Team Ico's track record. I loved pretty much every minute of ICO, I found the puzzles to be challenging and complex while still enjoyable and the breadth and scope of the game was to me truly magnificent! On the other hand while I did admire Shadow my admiration plummeted into sheer boredom somewhere around the five colossi. I simply didn't get it, I didn't see a true point to the game. I felt I was fighting the same battle over and over again (with minor discrepancies of course) and I really couldn't figure out why I was killing these things ( I know to "save the girl" but still...) that at the time seemed to pretty much be just "doing their own thing" (what did they eat BTW, landscape seemed pretty barren, lol). I know some who loved it though, I guess I just didn't see the grandeur of the whole thing. Hopefully Guardian will be more of a love-fest...or at least a like-fest ;).
I've never played Shadow but it's good to read some criticism of that game.