They were probably some of the most un-fun matches to play for me to be honest. Not a big loss in my opinion. They were always really messy or awkward to play.
Overall I think that the pros outweigh the cons for this game and the fact they've accomplished as much as they have in one year with a brand new engine, graphics etc. is a good foundation to build on in the coming years. Without even playing it I'm excited for what the future versions could bring, with something as monumental as the Superstar Studio being implemented on the first "new-gen" version of the game, and no doubt Create-A-Diva, Arena etc. will return eventually.