Vagex is good for something. I agree that Vagex doesn't deliver the amount ordered. Currently using it for like and favorite for now. I've since added two vagex like sites but the last one is best. Unlike Vagex, this sites only deliver 1000 at a time views.
What I like to see vagex do is he ability to schedule / deliver view and likes. Also, deliver higher quality views / comments.
Definitely, do not use it for comment not unless you want bunch of retarded assholes making your YouTube site look ghetto.