I rented Street Fighter IV, and when I first turned it on, I was pretty dang excited. I don't play this type of game very often because usually they don't appeal to me. This one did. But after about 20 mins of play, I had to turn it off. First off, I didn't know how to block, and couldn't find it in the controls. So I would fight and never hit the guy and get pummeled. Granted, I am definitely not a pro at games like this, but still I should be able to pick it up and at least beat the first 5 guys on easy! And lastly, there just wasn't enough play options. All you could do was fight arcade style against the computer, fight online against people, or play combo challenges. The arcade was what I spent most of my time with and it didn't blow me away. Challenges on this game where VERY difficult. I beat the first 10, but then it just got crazy.
Overall, if you are in to games where you have to train yourself to beat the first 20 people on easy, go for it, rent it. If not, this game is not for you.