OP I dunno what your complaining about honestly...
You play ranked SR?? Guess what same champs banned, same champs picked, nothing new here.
In fact I would say if anything Dominion has MORE champ diversity, yes some shine more then others but I find balance to be greater in many ways in Dominion, it has also allowed champs deemed trash on SR to find a niche.
Heimer, Shaco, Teemo all have become very viable on Dom
Panth, Riven do very well
Mao, eve, twitch....list goes on, my point being many underused or trash tier champs are now viable and fun as all get out.
Ranged DPS is still amazing but you no longer have the same distance and tower to use as on SR so it takes more thought and a change in how you play and you need to know how to kite and position properly. I run Kog on Dom and WRECK people, his damage and the fact he eats tanky types which people all rush to play makes him amazing, toss in his poke from very far and he is amazing. Cait with her super ranged ult, traps, kite ability and so on...again amazing.
Really I think when Dom first hit people all flocked to tanky DPS and boo hoo on anything else and as people learn to play were seeing strats develop and also seeing that **** near every champ can fit in a role on Dom.
Yes some champs are to much on here but the list is small...imo...
Jax is just to good due to smaller battles and his absurd scaling
Gangplank due to his global ult and the fact he can do **** near everything
Rammus has massive map control plus everything else
Only 3 I think are really problems on this map...akali, shaco, and so on are good but over hyped and feed of bad players.
I was super amped for Dominion and then I began to get a lil sick of it until recently and that is because I am seeing more champ diversity, more strats being used and smarter gameplay and wow it has become a blast to play.