Personlly I actually dislike the various races. I much prefer seeing a Shinigami fight a Arrancar than a Vizard against a Quincy, they were never meant to be a lot of them yet when RP's pop up you get 2 Soul Reapers and 7 Vizard. I would actually much prefer it if you could only be a Shinigami, the extent of their powers us up to the player to decide but if anyone can be anything it's going to be a bit complicated. 

But obviously it's up to everyone.