Petrucci sure has become less creative in recent years, some of his jamming is downright boring, but I think it's due to constant touring and tight schedules. In addition to 2 years of The Astonishing tours, he has his Guitar Universe thing now etc. He should just take the time to improve certain techniques again and hopefully get more creative in the process. Petrucci in his best eras has been so technically accomplished, a master of little nuances that make solos sound buttery smooth, but most footage I've seen of him from the last couple of years have shown a rather generic approach without much of that "magical touch".
Not necessarily linked to the rest of my post but a cool highlight from the guy is the solo on About to Crash, starting at 4:19.