I really liked the show when it first aired on CN, and I come back to it now and then to re watch my favorite scenes. I think the animation was really nice and unique, nothing less to be expected from Genndy Tartakovsky, and the plot was very well put together as well. Each character is well written and everyone has a good share of development, and the action is well balanced between serious and deep themes (a lot of fights are difficult and influence the heroes, instead of just the same basic fight scheme that repeats each episode; the show also tackles bullying and robot/human boundaries) and also funny and heartwarming scenes. The only bad thing about the show is that it never got at least a second show, but who knows, maybe in the future we will get to see what will happen.