leves are ridiculous exp with a party, but solo they are no where near hax, especially when you are looking at 65k tnl, 300 a mob for pretty challenging fights solo is not great.
leves are a lot of exp, with a party, leve sharing, in the right zone, on the right leve.
and the amount of difference those factors make is huge, its like 10x times the exp if you pick solo and take a random leve, thats a pretty bad design.
shouldnt take that much of a hit doing what is essentially the same activity, but basically more difficult.