Man, I still think 4e’s at-will / encounter / daily powers were an interesting idea that made non-magical classes more fun to play, balance issues aside. People complained that it made the classes too samey, (which is a valid criticism). But damn, I want cool, once per day fighter abilities on par with a spell.

I also thought that the progression of class -> paragon path -> epic destiny was badass and really enhanced the storytelling aspect of a character.