Everything the show did well:
-Cool premise where the rangers were abducted as babies and are trying to find their families now that they're on earth.
-The Tokimura family is continuously entertaining and likeable throughout the show's run.
-Meg is a pretty good robot helper.
-The episodes written by Toshiki Inoue are pretty good (which is weird since I usually don't like him as an episode writer), as these are the episodes were the team get more personality.
-Some cool world-building here and there.
-Really great final arc.
-The team being able to use their powers outside of their suits is interesting.
-The dynamic of them trying to get used to earth is pretty entertaining.

Everything the show did bad:
-Despite their interesting background, the team is just really generic and their personalities overlap way too much with the exception of the Inoue episodes.
-None of the villains are interesting with exception of the main antagonist who's just kind of allright.
-The plot twist behind Doctor Lie Köpflen is decent but not that interesting.
-The special effects for the on-ground fights in this show are really bad for the most part and end up making some of the franchise's worst. The mecha fights are also pretty boring.

Reasons for the show's strengths:
The staff tried its best to make an unique premise.

Reasons for the show's problems:
This was Hirohisa Soda 5th sci-fi Sentai show in a row without breaks, this was just when was getting out of ideas and the shows started overlapping a lot. The experiments for the show's action backfired.

Overall:
While the show's doesn't do anything offensively bad it doesn't do anything that particularly amazing besides the finale. It just ends up as a really average show with not much going for it. Despite not being bad I have hard time recommending this show when this franchise offers far better seasons.