I think that depends on the beer.
For weaker beers, like ordinary bitter or mild, a pint (or 500ml) glass is the obvious choice.
You could make a case for 330ml or 400ml glasses for the 4.X% strength beer most commonly sold in Ireland, but I think pint (or 500ml) glasses are fine. Once you start climbing much over 5% I think you are heading into strong beer territory though and should consider changing to smaller glasses.
For strong beers, 250ml to 330ml (with 1/2 pint sitting somewhere in the middle) stemmed glasses are the way to go, in my opinion. They remind you that you are drinking a strong beer every time you pick them up.