I have never played Ico so I can't comment on that, but I have tried Shadow of the Colossus and to me it looks like a wonderful game, but with huge framerate problems (and that really really matters to me). This is (in my world atleast) a huge problem with most Amiga-games aswell. An example is all Bitmap Brothers games which updates the screen like every second or every third frame. They wouldn't have had to do this if the programmers had actually used the Amiga Hardware instead of just doing a lame ST port (this is the reason I like to call them Bitari Brothers).
But ofcourse I didn't mean what I said very seriously, and it's really cool that the guy had an Amiga.