[Plugin: ShowBox] interested in your opinion

I have writen next plugin:
http://wordpress.org/extend/plugins/showbox/
This plugin should show content images of “Public” folder (in DropBox service)

And it seems to me people not like this plugin very much.
May be it have error in usability or in code or trouble in installation.
Can you say your opinion about bugs ?
Let me know your opinion please.