What ever happened to learning the matchup and exploiting the characters weaknesses? It seems like everyone besides the Japanese players are complaining about Yun. Most of them think that Fei is the only S-tier character right now and they've been playing the game for months now. With that said, I believe that there's another rebalance in store for this year. Capcom probably just wants everyone to try out Yun/Yang unchanged from the arcade version before thinking about re-balancing.
If you were never really a fighting game enthusiast, then I'd be better to stick with the dualshock. Getting a fightstick wont generally make you a better player. It's all about which method is more comfortable with you. But if you think that you can become a fighting game fan soon, then getting a fightstick would not be a bad investment (I suggest getting the Mad Catz TE Fightstick, it's a solid stick with quality parts).