Like I said before, there were so many problems with this show that made it deserving of this fate: the timeskip from Season 1 to "Invasion" was TERRIBLE and I had actually guessed that it probably killed the show's chance of getting renewed right there and then. Think of how many kids watching it from the start felt cheated? Or how many kids getting into it would feel utterly confused? It was a stupid, stupid move.
And there was also the bad, forced romances. The Light in general and their convoluted schemes. The loads and loads of characters, major or cameos, tacked on into the show who barely got developed and you'd only "get" if you were a comic geek. The JLA acting like a bunch of pricks all the time. The Badass Decay of FUCKING NIGHTWING. Gahhh, so much fail in the writing! Greg Weisman really struck out with this one.