I dunno about you guys, but my favorite mode in any online game was the Onslaught mode in Unreal Tournament (Warfare in UT3, I think?).
It works SOMEWHAT similarly to Dominion / Domination / Territories / Land Grab whatever you want to call this system... but with a touch of Castle Siege at the end.
There were several link points on the game located away from the main base, with usually two or three link "paths" to each base -- in order to become able to damage the opponent's base, you had to have one of the link points adjacent to the opponent's base... but the only way to capture one of those was to make a path of link points from your own base.
Essentially, it's a game of tug of war (well, except PUSHING rather than PULLING) where you can whittle away at your opponent's castle (Nexus?) each time you successfully create a link.
I think it would fit the League of Legends style much better than Dominion, although I am looking forward to this new game mode and a break from the monotony of "kill minions, kill jungle stuff, kill towers, kill nexus" that exists on Summoner's Rift.