Well I'm sure everyone that plays LoL knows about this but I'd just like to discuss a few things.
Firstly, although RiotGames have issued several videos describing Dominion I still can't gather what it's about. As far as I know you capture 5 points and for every point you capture you gain points and first one to something like 300 points wins. I don't know how you capture points etc etc etc...
Secondly, within the first few weeks of the release of Dominion, most people will be playing Dominion for the first time, and it may be frustrating your people playing for the first time to be mixed with people playing it for the 2nd-5th time.
I hope they do a new ELO rating for Dominion, it would sort this out a little bit.
Thirdly, I wonder what the meta game will be for Dominion, I assume damage dealing champions will be in demand, even more if they're quite beefy too (such as Jarvan, Garen and Xin Zhao) though that's just my guess.
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Overall I am moderately excited for Dominion, I don't think it will be as good as Summoner's Rift as that's the traditional map and everyone's got used to it but Dominion will be something new and hopefully appealing.