Also, quick ranking of the episodes so far as well as I can remember them (* = not too well):
S++ RANK
15. A Privateer Appears
16. Clash! Sentai vs. Sentai
S+ RANK
14. Now For Traffic Safety
1. The Space Pirates Appear
11. The Serious Rebellion
S RANK
*5. Judgement Pirates
4. What Are Friends For?
17. The Awesome Silver Man
18. The Big Abare With the Dinosaur Robot Drill
2. This Planet's Worth
A RANK
10. Card Game
*9. The Lion, Runs
*12. The Guaranteed Showy Episode
8. Little Spy Tactics
B RANK
3. Changing Courage Into Magic
*7. Niki-Niki! Kenpo Lesson
6. The Most Important Thing
13. Tell Me the Way
C RANK
D RANK
F RANK
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"Because they don't want to reason about what they consider a masterpiece and be hurt when they realize it was all useless." - Umineko on Lost