Well, Ramin is one of the actors with a hell lot of fans. Of course they will applaud the crap out of them when they see their favorite star plays the lead in one of the most beloved musicals.
The problem is that Ramin's voice can't create the dome-like aura that JVJ should have above the entire show. JVJ is the lead character and the only character requires full tenor range. Take One Day More as an example which is the best song to evaluate the cast, JVJ sings first and keeps the song going with repeated "one day more". He is the skeleton of the song, then other characters add substances in that make us ultimately feel the song's power and care about where the story goes.
Ramin's voice is way too sharp in those high notes that sometimes I even feel JVJ is absent in this song.
It really hurts to admit, but seriously I think he is not good with JVJ. But hey, we can still hope he returns as Phantom!