Yeah, the only Sentai/Power Rangers series I've actually watched all the way through are Power Rangers in Space, RPM, and Gobusters. Gobusters made me instantly fall in love with the series in part due to its giant robot fights being actually dynamic. (Except for when Gobuster King/Oh (the first one, depending on whether it's dub/T-N/OT) is introduced briefly. Those sucked at first.) I tried watching Shinkenger, and the stiffness and waste of time that the robot fights were in it drove me off the series.

The Hopper Bros are so ridiculously bad of a plot idea it was actually the most engaged I was during the last fifteen episoes was to watch them in morbid facination. Admittedly, I'm a huge fan of watching enjoyably bad movies, so...