I still say snatch the guy up and fly of with him then pin him and breathe on him. Dragons are very powerful if they fight like dragons, flying around, using breath weapons, throw people around.
There is still a feat for snatching people up if you are bigger than they are I believe? Also flyby attack is a good one. That way you can fly/snatch/fly up/drop in the same round if you like and end the round out of close combat range. Dragons aren't terribly maneuverable though so you probably also have to spend some of your move maneuvering. Thats when it comes in handy to have a breath weapon.
All things considered though Robilars Gambit is pretty broken against other fighter types so if you are intending to use mostly big brute monsters i suggest banning it from that campaign. If you plan on using wizards, archers, goblins with firebombs, dragons, air elementals and whatnot it shouldn't be that much of a problem.