I don't know about GI Joe. From the preview, it looks way to cartoonish. I don't know what kind of flips they were doing, but it looks way too fake.
I am having high hopes for the Street Fighter, mainly because I hope it hopes. The first movie was absolutely horrible, but maybe they can develop a good storyline on this one. Also, I like focusing on only one character like they are doing on this one (and Wolverine, which looks awesome) because maybe they can do some sequels with other characters as the main focus. As long as it's not something far fetched. For the first SF, why couldn't they just do a fighting tournament.