I play that everyday, I think dominion is better than the normal game, short and sweet but then sometimes have to wait for 10 minutes to have a game.

Yeah man, sometimes 10 minutes.

IP and EXP rewards seemed to be lower than normal game but then a game lasts from 15 - 20 minutes so you can have 2-3 sessions of dominion for each normal game you play (usually 40 - 50 minutes).

Player skill requires all to be balanced. In my personal opinion, it is more important in dominion to have high hp and heroes like Ashe cannot tahan long.

You never tried playing it before?