I remember specific incidents from episodes that stand out. Quotes and such. If I had to pick one to watch over and over again though It'd be either Wild Cards or Divided We Fall. Who didn't get chills when Flash starts talking about the Speed Force!
I liked this episode not because it was good but because they think kids are stupid. When I first saw this episode it made me think these 2 guys are fighting in lava what would make Superman think that throwing Doomsday in a volcano would stop him when he's own heat vision was hotter and it didn't do anything. At the end where Superman drops to his knees and WW "saves" him also made me think they where just fighting in lava what was that going to do kill Superman.