I like that you bring up the plugin issue. I'm not sure what bug(s) in particular you're referring to, but to me it seems like having to download and install a plugin defeats the purpose of *not* having to download and install a client. Isn't the purpose of getting rid of the C# client to prevent users from having to download software in order to manage VMware?
Outside of that, I honestly don't understand the industry-wide move toward web interfaces. If you still have to install special plugins and/or software, how are they improving anything? Just some more thoughts!