Müller has been decisive in big games for teams that certainly weren't better than this Chelsea side. It's a crazy way to compare the two players anyway. It's like saying: "Replace Müller with Hazard for Germany and you have another attacking player who does pretty but ineffective things and lacks the mentality to actually win the biggest trophies." Obviously that wouldn't prove anything regarding Hazard's quality. Both would complement each other wonderfully.Muller being more decisive in the bigger games proves nothing as he's played for a team significantly better than anything Hazard has ever done. Chelsea have big matches in the Cl where they pretty much give hazard the ball and hope he can drag the team forward. Muller can stand up top, make intelligent runs and then hurt the opposition. Take Hazard out of chelsea and replace him with Muller and I promise you chelsea would be a mess.
It's sad if you can't appreciate what Müller actually offers and how crucial it is to his teams.