If i can think of one super sentai that knows it's target audience well but doesn't dumb down it's material to only fit the target audience and still remain humorous and enjoyable to a grown adult super sentai fan (like myself) I would go with Ressha Sentai ToQGer. the main strengths of the series i feel were the characters and their development as characters for example i loved how akira was a play on the lone former villian turned hero with a tragic backstory cliche (you'll see what i mean when you see his debut episode)
 and that finale  was a perfect way to end the series  (they were epic)

Best episode: I can't decide most of them except the ones i picked as my worst are really good

Worst episode: Station 38: let's make a movie

Best character: the Toqgers, akira, and the conductor

Worst character: If i had to pick i would go with Wagon ( i liked her as a character but she had way too many obnoxious moments)


But all in all it was a fun and enjoyable series and i'm really glad i watched it

Edit: the series is good but not perfect and the films (not the crossover ones) were awful 

Best Episode: Live Again! Zyusouken

Worst Episode: Become Small!

Favorite Character: I like most of the main cast but if i had to pick I'd go with Geki or Burai

Least Favorite: out of the zyurangers it would be Mei (i like her as a character but the episodes centered around her were kind of weak)

best Doramonster: DoraTalos and DoraFranke

worst Doramonster: Dora Silkis


Zyuranger to me was way better then Mighty Morphin power rangers by a long shot, but on it's own it was above average, the show did have a habit of repeating morals, bandora was annoying at times do to her annoying musical numbers, the characters never fully changed as characters through out the whole series and it didn't fully pick up until burai shows up so all in all i give it a 6/10