I won't pretend like it's a classic, like say Batman, Ninja Turtles, or so on, but I can see it catching on in the near future in other media. It has great potential that I think can be explored more and probably will be explored more.
The show itself certainly has its flaws, the animation is subpar, the action could be better, especially given what we've seen in kid shows lately, and the pacing isn't especially good as a lot is thrown at you without letting most of it sink in.
Yet, objectively speaking, it's really not as bad as haters would have you believe. The characters and story are totally serviceable, and it can get pretty heavy at times with the drama when time is permitted. It also has a nice connection with family ties and relationships between characters, some stronger than others. Plus it's a cool blend of science fiction and fantasy, resulting in creative set ups and possibilities.
So, again, I can't pretend it's the greatest show out there, but it's by no means terrible. Personally, I enjoy it. If you like superheros, fantasy, and sci fi, you might enjoy this.