What's great about this is definitely the animation and OST. I think this series is helped greatly by its good fight scene animation and if it continues to play into this heavy power shonen tendencies, i think it will continue to be as popular as it has. For this season at least.
Though you should not expect anything special from this series tbh. Standard MC gets power from some mcguffin. He uses that power to fight for good, sometimes the power gets out of control. That's pretty much what these 6 episodes have shown me.
The characters aren't anything special either. Now i know 6 eps aren't that many episodes to showcase how deep a character is but i honestly don't think they'll get any better. The MC is as generic as they come. The female main gets the same treatment male japanese mangaka seem to give all their female characters and the other guy seems to be a mash up of emo characters.
Overall, if you watch this for the fights? You'll have a good time. If you're looking for something deeper? Nope
