As expected, there's many balance threads about Dominion after this morning's beta. Discussing your experiences and theory-crafting is always fun to do, and I encourage!
However, I want to set expectations extremely clearly here;
You guys have a very small window of anecdotal evidence to look at. It's not really possible to accurately judge a game's balance on 120 minutes of brand new experiences. As such, while I love the discussion and will probably jump in a bit myself, understand that we're going to let you guys discover things and let the game mature a bit. Other than something egregious that gets discovered, we likely won't be making any changes for Dominion immediately on the balance front. It's just too small of a window to tell.
So, when you see something that seems strong, attempt to counter it. Think about options. Try a different tactic. This is the way you can get a better view of the real issues and what options are. Things like hearing casters are weak makes me suspect, when we've had the opposite of that experience
EDIT: Still applies after two days
EDIT 2: Anivia is amazing on Dominion. Malzahar and Brand are beasts too.
EDIT 3: Launch day! Still valid :P
As for the likes of GP, Singed and Lee they have been stomping for quite some time in Summoner Rift, its just amplified here.