Abyssal Exalted are the only type of Exalted that can raise their Attributes up to 6, this is done by one of their merits.
Honestly, if it were ANY other Attributes besides Appearance then it'd be pretty powerful alright. But since Appearance is only usable for Seduction (there is only ONE mention of Rolling using Appearance in Dark Ages 20th Anniversary) and since it can't grant us MDV (Defense Values not existing in ExWoD mechanics), it is utterly useless and could never be rolled (I've scoured the ENTIRE 2.5 Exalted Books for any mention of using Appearance in a Roll besides as a Lunar or an Alchemical, and I haven't found a single use for it).
I could kind of see how one might use high appearance. Something like:
When you first meet someone if you have 3+ Appearance roll Appearance against DC 7. On your first social roll with that person subtract the number of successes from the DC
So you like roll let's say 3d10 get 2 successes
And then when the first roll comes around and it is subterfuge+manipulation to get a secret out of them at DC 7, now that is DC 5. That is pretty strong I know, but it would be for just your first roll because no matter how nice you look people do get used to it.