I can't say that I thought Iron Man: TAS was a *good* show, but I loved it for one reason: The Mandarin. Both voice actors who played him delivered wonderfully hammy, scenery-chewing performances that made him by far the most hilarious character on the show.
One of my favorite scenes had The Mandarin entertaining Hypnotia in his garden (because of course he keeps a rose garden), quoting some tragic poetry and being so melodramatic that even Hypnotia rolls her eyes at the camera.