Well someone's condescending...
First of all, the Ninja Storm theme and Hurricanger theme had nothing in common. They weren't even the same type of music, one was mellow rock, the other was just generic rock...like every other theme song Power Ranger has ever had. And really, what the hell was so bad about Ninja Storm? That's one of the times it actually came out better than it's counterpart. The Ninja suits they wore actually looked like something a Ninja would wear...not like the windbreakers the hurricangers had. Or is it because of the lines that Dustin had? That didn't hinder the story, it made the character weak in some aspects, but the story itself stayed strong, unlike SPDs or Dino Thunders. It was the first time since the first seasons we had so many multiparters that pulled off good stories. The Samurai's Journey, the thunder brothers arc, even the power up was done good. Out of the three seasons of Disney, this is the only one I've really liked. But taste is relative, so to each his own.
If your only reason for Power Rangers ending is because "it's had it's day" then that's really weak. People said that back in Zeo, back in the first three seasons, and now you're only saying it because of a theme song? Please, for all you know this could be the greatest season of PR ever, or it could be the worst season ever. Also, these shows have never been americanized, they buy the rights to the footage to build a show around it. The fighting has little references to anything Japanese. And even when it is changed, it isn't as bad as in anime. Mainly because the fighting has almost nothing in it that makes you tell it's Japanese. It's all just very well made stunt work.
All rap isn't just people going off and cussing and talking about how good it felt when [insert] got his [insert] sucked by three different people in one night...most of that is the mainstream BS that has nothing on the good stuff. So, you mind telling me how a theme song that you haven't even heard yet is going to make a show bad? It could mean we get actual music used for the fights, and not fight songs, but actual instrumentals that aren't the theme played during the fights. Disney may make stupid moves, but we all know they can pull off the type of music that Mystic Force needs, there's a big difference between a one minute theme and the actual score of the entire show.