Best
1. Galaxy Robo is the best. It looks mean and serious. It's the so-called robot with a heart. Also, it's like Optimus Prime with regards to its tractor form before transforming. It's so strong and it's hands are BIG and can slice everything using the Iron Fist Aura Galaxy. The design is also cool. No wonder, it is the first secondary robo to finish the main villain(episode 51 of Hikari Sentai Maskman) eventhough Great Five(also of Maskman) was the first 5-piece robo in sentai history.
2. Turbo Robo- cool robot with shades
3. Great Five- the first 5-piece sentai robo
and also the V-Rex:buttrock:
Worst
1. Live Boxer- looks stupid and lame, its body is like a literal box
2. Titan Boy- the design lacks flair
3. Muteki Shogun- its castle-like apperance made the robot look "overweight"
and also Flash King- it looks stupid too:170: