I don't buy that Dominion is tactically more shallow than Summoner's Rift: I don't think people have been playing Dominion long enough to really explore the tactical options.
A ton of Summoner's Rift tactics seem more oriented on who got banned and who laned where against who: while in Dominion tactical decisions past champion selection seem more frequent.
Summoner's Rift is just so...predictable compared to Dominion.
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