- Robby's character. First of all, the actor is terrible. You really needed a bankable actor to carry that part. He had the third or fourth most important part in the series. The sequence in the last episode with the one handed kick was very poorly depicted too. I could never just get too much invested in his arc. It was also the most predictable one out of the lot. The daughter's arc was much more interesting one for me. I guess they are saving her as a karate competitor for second season.
- Transformation of Miguel and other outcasts into becoming the bullies they fought against was somewhat hurried. Needed some more breathing time between them being timid and hyper aggressive. You could argue it was done to depict how Johnny himself does not sees it materialise. But still, it was jarring to see Miguel being on the wrong side in that last fight. If show wanted viewers at that point to root for Robby then they did a poor job IMO, I was still rooting for Miguel
and on first look on internet, as were others.
- Finally, the twist ending of original villain coming back was not a good sign for me. So much of this series worked because it was intent on depicting everyone as a shade of grey rather than black or white. I really can't see the original bad coach being anything more than a 2D villain. I am also not really looking forward to a forced love triangle between 3 teenagers. May be the series will surprise me again in the second season it should get.