You listed Turbo as one of the worst seasons, and to some extent I agree just wondered what about it you didn't like? "I'm the new blue ranger!" springs to my mind
It's hard to pinpoint exactly what I didn't like. I definitely didn't like the "silly" nature of it. Obviously I wasn't keen on the child ranger either. I found it harder to like the characters we had grown to love, and didn't think much of the new cast mid-way through either. I guess there just wasn't an overall story as such... just your typical episodic detonator plot.