I don't like Raonic.
He's boring to see, but it's not the problem (when you're able to serve like that, it' ok if you try to strenghten your best shots).
The problem is that he is too passive against great players, and I think he lacks a little bit of charisma. Think about QF in Cincy against Wawrinka: 6-2 lead in first set, in the second you're supposed to give your opponent the final straw.
Especially if your opponent is a guy who's playing bad.
But he waited, and he waited and he waited Warinka to give away the match, so he lost 26 76 64.