Yeah I think so too.
Domination allows many new viable strategies
and it feels like the different mage abilities lead to more distinguishable books in domination than in arena, e.g. a VineSnapper zone control Druid, a BM with swarming Birds, a Johktari BM with Cervere, an elusive Goblin Swarm Warlord, a Warlock Buddy build, a DoT + Rise Again Necro, a labyrinth Wizard with gremlins, or any Mage build that goes for the Mage kill (except stalling/slow builds),...
Game durations are shorter as the V'Tar Orbs act as kind of a deadline. Therefore turtle tactics and stalling tactics, which many people do not like to play against, dont seem to be the best choice in Domination.
For now Domination is my favourite game mode!
Moreover I prefer the idea of Mages fighting for power (the V'Tar Orbs) over Mages simply bashing their heads in the arena like gladiators ;-)