I don't think it's very popular, but then again I also don't feel like it deserves to be any more well known than it already is. In my opinion, there are far better anime out there that deserve much more attention (whether they receive it or not is a separate issue all together) and currently DC gets as much love as it is worth. It's far from the best thing I've watched/read, but it's also far from the worst. Only reason I see it as better than average is because of nostalgia. As for the big three shounen, Naruto is over (kinda), no one really gives Bleach the light of day anymore, and the only thing worth any attention is One Piece. Their reign on the anime community is crumbling, that's for sure.
A bit off topic, but anime is nothing like it used it be over a decade and a half ago. No one wants to watch a never ending series, so those have been virtually snuffed out of existence. The age of fansubs are coming to an end now that Crunchyroll and Funimation have monopolized the market. The times they are a-changin', for better or worse.