Define 'worth it': what is most valuable to you?
If you mean, damage per round, there are others here who can give you chapter and verse about GWF v Duelling v TWF/DW.
If you mean, is AC more valuable than damage potential, there are pluses and minuses IMO.
If it's a concept thing and you fancy cleaving enemies with a great sword or warhammer, then yes.
Hard to answer without a bunch of other peoples' opinions on THEIR preferences, unless you can give a wee bit more info on what you hope to achieve; what you see as 'worth'.