When Yoshi first appeared on ECW he was a breath of fresh air. His style was uniwue tot he WWE in that he incorporated Japanese mat techniques with ariel moves and high impact moves as well.
His ECW run was decent and I thought for sure he would become at least a mid-card champion at some point, but these days we barely see the japanese wrestler unless he is in a random tag team match jobbing to someone or a comedy skit back stage.
Yoshi is super talented in the ring and if anyone has seen any of his tapes from before he was in WWE they would tell you he is being sorely misused. Go find some of his NJPW matches and you will see he has more to offer.
With WWE in the middle of a youth movement as well as an international expansion in terms of talent and touring, I am shocked they have not used Yoshi in a more upfront capacity.
What Yoshi needs to do is lose the Anime theme music as his entrance song and get something tougher sounding, then he needs to turn heel and drop the cooky fish-out-of-water routine where he pretends not to know what anyone is saying.
He could be a future champion if he was packaged right and given time on camera to show what he can do with a top notch talent.