It's great!

To make it short: The combat system is really fun but might take some time to fully understand every rule and effect. The same goes for the character kits.

But the reason I actually got so much into it is the Penacony arc. The cast of characters and the story is probably the best I've experienced in a while regarding video games where the main focus is not ONLY the story. The world building and its surrounding lore also is really engaging. Furthermore it is not necessary to own a single five star character to have fun (you gain stellar jade over time so you will definitely own one at some point anyway). Meaning it is really f2p friendly as well and doesn't require you to actually spend money on anything ( stellar jade ).

So: Interesting characters, story and worldbuilding, cool combat system, really nice graphic design and animation.