Having been to both coasts, I can agree the seafood here isn't the best. And while there are more options in bigger cities for sure, I certainly don't agree that it's hard to "find one place that might be acceptable."
Go eat at Fruition, which I think was rated as one of the top 15 restaurants in the country a couple years ago. There are great places to eat in Denver - places that would more than compare in some of the mega cities. There aren't many, but they are there, and probably cheaper too.