Yeah, Gatekeeper sent them all to sleep, right? Even more impressive since they were on a boat (surrounded by running water, basically). It wasn't very far, but still.
I label "brawlers" wizards who would win in a one-on-one magical slugfest against Harry. Luccio (at least Original Luccio), Morgan, Ebenezer, Gatekeeper, Cowl, and probably the Merlin would certainly kick Harry's ass. That doesn't mean the others wouldn't win, I just think they'd probably not do it by tossing fire around.