There are good and bad creative teams in Marvel comics but some of the great creative teams have worthy successors.

Mark Gruenwald had a fairly unremarkable run on Captain America and was succeeded by a much better creative team, Mark Waid and Ron Garney who were succeeded by a much worse creator by the name of Rob Liefeld.

Transition from Todd McFarlane to Erik Larsen is good for Spider-Man book.

When Walt Simonson left the Thor book, he was succeeded by Tom DeFalco and Ron Frenz produced good and entertaining Thor stories, altthough not as good as Walt's. It was a great transition for Thor.

John Romita is better on Spider-Man than Steve Ditko.