just a note on the lot of posts by unhappy people... you'll tend to see this in almost any forum of any type. it's just that the happy people tend to be happy in their own little world, and the unhappy people let everyone else know.
not saying it's bad -- just tends to be the way it is.
as far as limewire having its flaws... yes, it definitely has room to grow. i'd be really interested in hearing things, whether its usability issues or design changes or anything that comes to mind, that you think would make it better.
people's voices are definitely listed to. the 'resume' button from the library was added, the 'browse host' button from the uploaders screen was added, a completely redesigned and much more advanced statistics reporting was added, internationalization was added, etc...
there are many changes that can be done to the network side of things that would make limewire a better player on the network, but there's also lots of things in design that can make limewire better for people to use.