Yeah, it was a big problem in Adventure 1. Things got slightly better in Adventure 2 largely because the rivals did somewhat speak to each other as rivals. But still had many problems. It wasn't really until Pontac and Graff that the writing approached anything near professional in terms of the quality of the written dialogue. Flynn's writing is still superior to anything Sonic Team themselves have written. He's clearly very good at coming up with good concepts for a story. They were just not well realised in Frontiers.