Damn, a lot of people sure do love that goofy, helmet-wearing dolphin!
Still surprise there is still so much hate about this logo. I chalk it up to 3 things:
1. There is a lot of resentment and frustration with the current regime. All the feelings associated with Ireland, Ross, and the recent blunders are seeping into fans' perceptions of this logo.
2. It breaks away from tradition. As hokey as the Dolphin's logo has been over the years, it was once associated with greatness. People grew up with this logo as a symbol that represented those great memories. Unfortunately, many people seem to overlook the fact that the current logo also broke away from the traditional look, and the current logo has only represented mediocrity. It is the Wannstache of logos.
3. People formulated an opinion based on rough, unfinished protoype, and have latched onto that opinion at all costs. The initial leak was very rough and blurry. It looked just like a big swirly thing. A designer on another forum used that blurry image to create their own vector illustration of what they thought it was SUPPOSED to look like. The thing didn't even have an eye, and looked somewhat amorphous. There was strong opposition against that logo, and I think that initial reaction has tainted their ability to see the FINISHED logo with fresh eyes.
I honestly believe fans will come to like this logo a lot once they have seen it on the helmet and with the uniforms. Remember, a logo doesn't exist in a vacuum. It is meant to be a piece of a larger branding identity. The uniforms are a big part of that.
I find it interesting that non-Dolphin fans tend to think that this version of the logo is a marked improvement over the previous logos. See this thread for example:
http://www.reddit.com/r/nfl/comments/1al658/possible_leaked_dolphins_logo_on_a_new_uniform/
It seems like the only people that dislike the logo in this thread are Dolphins fans! Fans of other teams were strongly in favor of it.