Blast! Just wrote a comprehensive review, got logged out while writing it, now it's gone after hitting submit :( I give a 4/5, the usability issues I found seem to have been noticed by other users and, most importantly, the development team. So maybe soon a 5/5.
To the previous poster, this is by no means normal, JoomFish should handle images just fine. Go to the project homepage as linked on this page for information and guidance.