I think what people are saying is that Petrucci lost his feel. For example, listen to the solo on Live in Tokyo (the one that's at the end of To live Forever) .... or, even watch the solos on his instructional DVD, "Rock Discipline," then compare those performances to the solo he does during, "Hollow Years" on the Budokan DVD. He really sounds like a completely different player, but not for the better.
I TRULY mean no disrespect when I say that. But, unfortunately, it's the truth. JP used to be so melodic and unique.... he really did have his own voice until.... probably the early 2000's. Then, something happened. I don't know if it was playing with Jordan, Portnoy pushing for heavier music within DT, maybe a combination..... it doesn't really matter. What matter is that it's evident - at least to me and many other fans.
So, yeah, there's some truth to the, "no feeling" comment that people make - except it's not that he doesn't "have" feel, it's just that he doesn't USE the feel he used to so amazingly have.