B1ad3 was a successful IGL during his career and has stayed a relevant coach afterwards. While he isn't the best coach possible, he IS a good coach and no one can take that away from him.
To be a good IGL, you need a good understanding of the game. If you don't, then you're a shit IGL. Period. Just because you aren't a NaVi fan, doesn't mean that the people on the team excluding S1mple and Electronic are shit. Flamie is a bot nowadays, however.