Freenet is a resource hog, and can be rather slow. It's also not particularly interesting for people who just want to browse and access the "normal" web anonymously. There are few services. There's little interesting content.. Plus it's not clear Freenet can really provide that much as far as anonymity goes. The consensus recently has been that opennet is quite vulnerable, and the only way to be really safe out there is with a global darknet where everyone only connects to trusted peers. Achieving this is not so easy, and there are potential complications.