Ew.... Power Rangers, really? I can give you a summary of every episode: Lets fight some monsters. woah that monster is really big. lets get really big. oh no we're losing to the monster! use the secret over-powered attack that cant possibly fail! Yay we won!
Everyone to their own opinion. Also they face challenges in show and except for the fighting part, every bit of teamwork and overcoming challenges is real in life, this is just to attract kids and if you can come up with merchandises selling that well and a 20 year strong franchise, find me, then I'll apologize, if not, learn to see the situation.
Kids won't really need much, if you want one with more expression, check out Super Sentai, the original, Power Rangers is an adaptation. The Super Sentai themes are ranging from dark and edgy to hilarious and they don't have faces like blocks of wood like Power Ranger actors. Trust me on this one. Besides, I don't think you can act EXTREMELY well either?