[Keeper of Dol Guldur]

Well wait just a moment, because weren't all of Gandalf's plans sneaky in some form or another? His job was to get the free people to take down Sauron, and he did it sneakily so that Sauron wouldn't find out and totally prevent it. So it was Gandalf who was a cheat, but his cheating was ordained by the Valar, so basically it can't be called cheating at all, it is considered piety (or since he is Maiar himself, I guess mere mortals aren't qualified to judge those actions). As far as Aragorn's calling Sauron out so his eyes wouldn't be on Frodo and the backstabbing plot, Aragorn initiated a ruse. He was heroic, because reason said that to pull off that ruse, he'd still have to fight the battle of his life, regardless of whether Sauron actually showed up or not. But the ruse itself was Gandalf's trickery. I was tempted to call it cheap trickery, but it cost a lot, whether in lives, years or other things.

Gandalf was a tricky devil.