Here is my take on Mika's demeanor while playing. First of all, Mika seems to be a very well mannered person. He is also pretty quiet and well reserved, and doesn't show much emotion any other time except when playing pool. He is obviously passionate about pool, and sometimes passion is the only thing that allows certain types of personalities to show much emotion. I would say this is the case for Mika and I think that is a healthy way for him to let some emotion out while playing pool. He does have a few idiosyncrasies while playing like rolling his eyes, throwing his hands up, or maybe even some infrequent abuse to his cue. I just look at it as the nature of the game, and it is no different than an NBA player smacking the ball with his hand, or bouncing it a little extra hard off of the floor. We tend to notice these things a bit more in sports that are not team affiliated. The way I see it, Mika never disrespects anybody, or has any type of argument. Furthermore, he never puts any type of racking moves or shark moves on his opponent.
Mika is the future of pool and I'm sure he is well aware that some people view his display of emotion at times, as being less than sportsman like. I believe we will see an improvement as much as he can help it, but remember that passion for the game and competitive edge can sometimes make us all do something that we wish we had not. But, until Mika does something that is just completely out of line, I really don't see much wrong with his actions.