Secret Society of Second-Born Royals was a great movie for what it is. This is not on a MCU budget but still showed a great family movie with super heroes. If you go into this expecting a fun, young teen movie, that has action, drama and romance and not hold it to the standards of Marvel than you should like it if not love it.
I hope they do a sequel and put a little more money into it and make the special effects a little more believable and less green screen style. There are a few scenes where it was slightly corny just because of the lack of digital editing.
Even with that I did enjoy the movie and I'm sure it will get watched again in the near future.