not quite true. Ive been working with WP for social networking and can do pretty much everything D can do. You just have to use a few plugins to get the same features as D has integrated. There are also responsive social networking themes for WP that already do all the key functions of D, plus you have thousands of FREE plugins to use on top!
Your experience of them may have been 'really poor' but thats far from my experience, maybe you just didnt have the right themes/plugins.
Dolphin app is see more very limited need massive improvement to make it fully functional. Responsive kinda fixes this in a flash... dont get why people seem to be against the idea!???