the speed at which games happen and the opportunity to "turn it around" as it were make this mode far more enjoyable to me than Summoners Rift. I also don't feel as aggro when I lose (be it by 1 point or 100 points) due to stupid mistakes because the game is over so quickly.
By perspective in SR, if I have 2 players who feed, give up a lane and refuse to surrender 45 minutes in when our score in 9:36 I have a very hard time wanting to continue gaming in the solo queue...
If nothing else, even if Dominion DOES get boring, it'll be a **** fine relief from the SR games I want to strangle my team mates in...