Olneyce, your tips on Throne Room are great, and could be the beginning of an article. But I'm confused about this:
The fact that Throne Room autoplays is one other reason that it's worse than King's Court. That doesn't matter all that often, but it can be a real killer sometimes.
I know that KC says I "may" choose an action, while TR forces me to, but I wouldn't normally play Throne Room unless I wanted to choose an action. I can only think of two cases where that would matter. I can imagine playing Golem, revealing a Throne Room and something else, and only having a Trader (or another mandatory trasher) and good cards in my hand. That would have to be be pretty rare, I'd imagine, and would be no riskier than the direct danger of revealing the Trader with my Golem.
The other situation I can imagine is having 2 Throne Rooms and a terminal drawer in my hand. Simply throning the drawer would get me extra cards, but no way to play the actions I draw. Throning the TR and then choosing the drawer would allow me to draw and then play (twice) any action I draw... but would also require me to play it (twice). This could lead to an amusing Ambassadorial disaster, for instance. Is this the sort of situation you meant?