I thought the episode was awesome! Doom was done well. Best Doom I've seen on TV since Iron Man Armored Adventures.
What I love about this show is how it adapts various parts of the Avengers canon and mixes it all together. The scene with the Quinjet attacking Castle Doom and the scene where Wasp is yelling at Doom and Doom turns around and totally owns her with his awesomeness is from Mighty Avengers #9-11.
It was done way better in EMH.