I saw them two weeks ago in El Cajon, CA in a little place for thousand people. Just amazing traveling too many kilometers to see them, and of course just pure metal and a lots of fun.
The unsaid truth is that Petrucci is been "The Band" from the moment when Portnoy left the band. LaBrie's singing is been horrible to listen to for a very long time already and Myung is always been just in the background both musically and personally (even the band is very hard trying to state otherwise). Rudes then on the other hand is been very controversial cos 50% of the fans either love him or hate him due to all the circus sounds which have ruined multiple new otherwise good songs. Petrucci is the only player who is really not replaceable by anyone. If he would leave then the whole band would need to quit since the Dream Theater's music is so heavily tied up to his sound and to his playing style in both good and bad.