Most Liked / Least Liked Power Rangers Series

Hello, All.

As a relative newbie to PR fandom, I wanted to ask:

From your travels / interactions with other fans, which do you perceive to be the most liked & most disliked Power Rangers series?

I am NOT trying to stir up a hornet's nest. I ask this question because I am trying to watch through ALL the Power Ranger series (I am only on Zeo right now. Gots a long, long way to go) and I wanted to get an idea of the "temperature" of fan community reactions to each series.