yeah sneak attacking a dragon might be hard. i think the trade offs are rogues take more damage but can do more damage to the dragon while hes in the air warriors can take alot more *damage, but can only BYAH at them from the ground mages have little to no armor, but can nuke a dragon thoughout the fight
Seeing as though all wildlife and creatures now sleep at certain points, sneaking up may be possible on a Dragon. It would be cool if they did a stereotypical dragon quest where its guarding some loot that you have to steal, like Tom bombadil in LotR. You're gonna have to run fast when that beast wakes up though.