So to be clear, you had to go to a seperate webpage, download the plugin, go back to Facebook, and start up the chat session? I want to make sure that the old MySpace experience current FB experience are the same.
Skype is great for video calls, Phone calls...and thats about it. Facebook does everything else.
Of course, given the good relations that Facebook has with Skype/Microsoft, I doubt they have any desire or intention to kill Skype, but the two services are certainly competing for the same users now.
Facebook's video chatting feature has no influence on my decision to use Google+, but it does influence my decision to use Skype.
Personally, I don't like the idea of video chatting through Facebook. I use skype exclusively to video chat because its what I am accustomed too, it's the application I trust. Trust being the keyword there because I do not trust Facebook.