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.

I still like minions as a concept. Dinky little guys that have 1 HP but if ignored will still do a decent amount of damage?

Yeah it’s good stuff. Still rewards people for splitting fire too so suddenly it’s fine to attack zombie ABC even if your ally has already damaged zombie XYZ.

4th edition gets a lot of hate but I definitely enjoy borrowing things from it.