I still think Jamey Sheridan did a better Flagg than Matthew McConaughey. I don't know if anyone else thought Jamey did a good job but I couldn't help compare the two. I saw The Stand miniseries before reading the book, too, so it definitely colored the character when I got around to reading. I'm sure there's many differences with Flagg in The Stand between the book and the miniseries that someone would be happy to cite. McConaughey was so one-dimensional. He was just mean and focused on causing pain and humiliation. He didn't want Roland dead for any reason except that Roland kept coming after him. He didn't enjoy himself, he didn't play with people like pawns. He was very confident in himself but it was never established that this confidence was ultimately his undoing (of course there was no Mordred, either.) He wasn't fun to watch like Jamey's Flagg. I haven't read The Eyes of the Dragon in decades so I can't recall Flagg's behavior there to compare. Walter was just flat but maybe it wasn't McConaughey's fault specifically. Come to think of it, no one really had much depth of character in the movie. Even the flashback scene was thrown in at the last second from what I understand.