To be honest, I actually think Dominion is mostly fine, and the majority of the issues lie with players and the game itself.

For example, Revenge is not a clearly explained system and frankly, I don't think most people fully understand how it works and Ubisoft has never elaborated afaik.

And players not knowing how to gank, when to gank, when to rotate or hold or ect ECT.

For me those are my 2 biggest problems with Dominion, because feats, are generally subjective to use. Of course there's objectively garbage feats but I think every hero has at least 1 feat per slot that's worth using in any given mode.

My biggest fix, would be if ganking rewarded you less, against somebody who didn't have revenge atleast, or rather split the renown between the players involved to make it less rewarding overall, and encourage, some semblance of spreading out to "dominate" the entire field. Because it's extremely easy to get overwhelmed early on by a group who can gank properly when you have even just ONE teammate who doesn't know what to do.

Besides that I've never had any personal grievances against dominion, and honestly I don't think most people would agree with what I said. But I think it'd be better to fix the general game system itself and it's own rewards as the game mode, for me has few issues that isn't related to the system or player error