Was in Reykjavik at the end of January 2013 and unless there has been a dramatic change in the last 4 years, I too would describe it as pretty uninspiring.
There wasn't a huge amount to do during what they called daylight (basically dusk from 11am to 3pm) and the nights were spent in quiet local bars and restaurants. I would describe life as "Quaker like" which, compared to today's modern life where everywhere is basically identical and one city the same as the next, could be refreshing.
Not to ruin the entire tourist industry of Iceland in one paragraph, I should mention that my daughter was there in the summer of 2015 and loved it. From her comments, I would return; but not in the winter months when S.A.D. is at its peak.
Enjoy