Game review websites are good and all, but sometimes you have to trust your own gut feelings about a game. IMO, Ryse is obviously a great game, and the gameplay videos of it prove this.
The reviews for it on gaming websites seem polarizing as well. Some really like Ryse, while others think it's extremely mediocre (most likely due to bias against the XBOX ONE). Just remember, an opinion is nothing but that, an OPINION.