[MattEmily]

let's see shall we?

MMPR = Green started the tradition which helped the show become a fad.
MMPR2 = White continued with the tradition of the great 6th.
Zeo = Gold was a great 6th.
Turbo = no 6th. Blue Senturion was just a 6th member. Phantom wasn't Turbo's 6th Ranger he was just an ally.
Space = Zhane was great.
Galaxy = Magna Defender was great but once the original sacrifices himself he loses that part of his character.
Lightspeed = Titanium was interesting but not enough time to really cement himself as anything.
Time Force = Quantum was one of the greats all because of how much of a jerk Eric was.
Wild Force = Merrick was interesting to say the least but he was a bit dull since he was never an official teammate at the most he was just an ally even though he was supposed to be their 6th Ranger.
Ninja Storm = Cam was a great one
Dino Thunder = Only a 5-member team but Trent is classified as a 6th Ranger and because of which I thought he was a fine 6th Ranger but only in the beginning.
SPD = Shadow was 6th member so he was great but Sam their 6th Ranger was pathetic.
Mystic = Daggeron was one of the greats.
Overdrive = Tyzonn wasn't that impressive.
Jungle Fury = no 6th
RPM = Gem and Gemma weren't that great
Samurai = Antonio wasn't that god
Megaforce = Robo Knight was a nice idea but not a great 6th Ranger.
Super Megaforce = Orion wasn't great.
Dino Charge = Ivan wasn't great.
Ninja Steel = Levi had a nice story but other than that nothing else..