People differ, beer differs. The other day I checked on the beers available on draught in the Half Moon, Bishops Storford, which is a good session pub. They ranged from 3.2 to 5.6, and bottled beer goes higher than that. That's Original Gravity - I'm not sure how it measures in terms of "proof".

But the idea that the strength of the beer is the primary measure of quality doesn't really stand up to examination. I'm with Dave Bryant in generally preferring to drink the weaker beers, and more of them.