By that metric if you produce lots of electricity at the exact times when no one needs it, you are a hero because lots of MWh for some small build cost.

That metric ignores how much real world economy is being enabled by the power that you generated, roughly the price for which you could sell your energy in a free market.

My point would be that energy is much more important when the sun is not shining, etc. that makes e.g. solar not as good as a naive calculation would say. That sould be accounted for right?