Pretty good! This is (roughly) how I believe the tier list would be, if the characters' in-universe attributes are taken into account, rather than the gameplay of I:GAU.
Fun tier list
I usually disregard Batman in all conversations. The amount of wanking both fans and writers give him is ridiculous.
Flash is a tricky character. If he tapped his full potential, he really would be unbeatable. Lots of characters can do crazy things with their powers though, like Superman for example.
Hal, Black Adam, Sinestro and Shazam belong in the same tier as Supes. They have all had great feats throughout their histories and all of them can go toe to toe with Superman, even they would lose in the end.
My last gripe is that Ares should be above all of them. Yes he has been defeated by WW in the past, but there is usually a plot reason behind his defeat. He is one of the most powerful Olympians. He is basically Diana's Darkseid. (And I don't think Clark should be able to handle DS alone either.) Ares is a full league level threat.
I'm not familiar with characters like Raven, so I can't comment on them!