That opinion started for most devils fans around 2010. Before then a lot of fans couldn't care less or never liked the green. Hell you see in the previous posts with people who remember the switch in 92 (I remember it) a lot of fans were happy with it as green was a goofy color on it. The greens were always available on eBay for years but only a small % of fans wore them up until 2010.
It has very little to do with it looking great as there is part of a trend in sports over the past few years with Retros.
I think fans were fond of the green earlier than 2010, but the only ones who owned one were the people who cared enough to search on ebay or people who were jersey enthusiasts. Once they made the 2010 throwbacks easily available via all retail jersey outlets, that's when they became mainstream because they took minimal effort to find in any typical sporting goods store, including the arena. I agree with you though that they weren't that good-looking and are only popular because of nostalgia.