All dominion seems like is a free for all, kill kill kill. Even though that's not the number one goal, but that's what most people get caught up on. And that gets boring. Atleast in SR, there are more things going on, more thinking and more strategy is needed. (I know you need it in Dominion, but not alot, just go cap clockwise, or counter clockwise and you'll be fine.
Dominion is fun, though I can't see myself playing it constantly because all it is, is mindless killing for 25 mins. That's just me though.