Common bans in no particular order:
Akali, Kog maw and jax: Jax ok, he is pretty strong, I prefer to ban other stuff, but its not terrible, but akali is a bad joke. Its not even on the top 20 most dangerous champs in dominion. Kog is ok, I dont mind the ban, but I think overall is a waste.
Good bans that I rarely or ever see:
Vayne: She is nuts, but I rarely ban her because most people dont pick her or they suck with it.
Champs that can be better than what the community perceives and some day may be banworthy:
Blitz, Eve, Wukong, Karthus.
You just named my two favorite Dominioners.