When I got to play it, it was very fun, but if it is all the same thing then I can see it not having much lasting power.
GOW is STILL fun to play...and the story is part of the reason. Definitely one of the best games for the PS2 period. GOWII feels like a "middle" installment. Too short, but great graphics for a PS2 game and while it added a few new features, it was pretty much the same stuff as the first game, not that that is a bad thing.