Innovative, yes! Soul Reaver is a really creative way to make a game. It also was one I never could beat.
The problem I ran into was that with two game worlds it was twice as hard to figure out what to do, and where to go. The confusion eventually annoyed me, and i never finished the game.
I kinda wish I had completed it though, as 'Legacy of Kain' storylines have a penchant for being really good, and i missed out on the tale by not finishing. if you have the means though i highly recommend picking up this ps1 classic.