Those comparisons are just as stupid as it gets, you just don't realize it !! Ah AH !
Seriously, Petrucci has done quite a few tasty, melodic and emotionnal solos that can give you shivers ( if you can listen to the music without the stick in your ass that says Petrucci is an emotionless shredder but I agree its a hard one for some to pull off !!!)
Examples : Another Day, Learning To Live, A Change OF Seasons, Hell's Kitchen ( shred with emotion, yes it is possible who would have believed?), Voices, Lines in the sand ( one of the most beautiful solos ever !), peruvian skies, The Spirit Carries on (his gilmour tribute by the way), goodnight kiss etc etc etc stuff from liquid tension is fantastic !
And the solos of the Train Of Thaught album were meant to be extreme, fast and brutal !
And I agree that is playing has not evolved in the good direction (too machine gun like) but he can be very tasty when he chooses to !
Gilmour is the master at what he does but he does just that, nothing more !
Back to topic : Rolling Stones : Sympathy for The Devil : the idea of the solo is great but the excecution is just pathetic !