That policy is dumb on Ubi's part, especially if they don't explicitly state it anywhere during the signup process. Tons of people use Gmail as their primary email service.
Also, I liked Outlaws. I thought it was a lot of fun, and like others said, it was something different. It felt like a nice change of pace from the tired Jedi versus Sith plots that most every other SW games have. While it kind of stunk in some ways at launch, it played so much better after the post-launch patches addressed some of its worst pain points. Still not a perfect game, but it wasn't garbage either.