Ah, that's too bad.
This last decade hasn't been good for western serialized cartoons. I remember Teen Titans getting good then it was gone. I think Justice League just ran out of steam. I really liked Young Justice and that was just shitted on by Cartoon Network. Wolverine and the X-men ended on a cliffhanger as well.
There were a few reboots on Saturday mornings, but they didn't last long either. The only superhero shows I remember actually having an end was the 90's era Spiderman & X-men.
Justice League had a full run and a proper ending (even snuck in a Batman Beyond ending in the show).