Energy return on investment. EROI for nuclear can be 50 with centrifuge enrichment. EROI for coal is about 80. EROI for wind is about 18. http://en.wikipedia.org/wiki/Energy_returned_on_energy_invested
The argument against wind is just that it's not as good as coal or nuclear for driving a large economy. There may be other things in its favor, but it's just not as efficient altogether, including the energy required to build a turbine and maintenance of the turbine over its life.