You liked Dirge of Cerberus more then Oblivion? That's a first.

But yeah, 40 mins isn't really what I would consider adequate to form an opinion. Generally, I'm not happy that I gave a game a decent attempt until I've played about 5 hours. Even then, I probably wouldn't try to write a critical review of the game unless I played at least ~70-80% of what it had to offer.

Although your opinion does seem to reflect what is generally being said about the game by professional reviewers.