1) Shinkenger
2) gekiranger
3) carranger
4) Jetman
5) Gokaiger

1. Dekaranger
2. Shinkenger
3. Gokaiger
4. Gekiranger
5. Zyuohger

Honorable Mentions: Jetman, Magiranger

Top 5 is something like:

Megaranger
Go-Busters
Akibaranger
Kakuranger
Carranger

I think?

I've only watched about a 1/3 of it, but GoGoV is rad
Hurricanger's cool too.
Also Jetman

1. Carranger
2. Gokaiger
3. Liveman
4. Shinkenger
5. Megaranger

Gokaiger (Super Megaforce)
Zyuranger (Mighty Morphin Season 1)
Kakuranger (Mighty Morphin Season 3/Alien Rangers)
Ninninger (Ninja Steel)
Kyoryuger (Dino Charge/Dino Super Charge)

1) Gokaiger

2) Dairanger

3) Kyoryuger

4) To Be Determined

5) To Be Determined

1) Gokaiger
2) Kyoryuger (might be taken by Kyuranger later on)
3) Zyuohger
4) Toqger
5) Go-Busters

Goseiger, I miss you
Kyoryuger
Shinkenger
Boukenger

And moving quickly up the list is the current season.

1.Dairanger
2.Gokaiger
3.Shinkenger
4.Kyoryuger
5.Jetman
*This is based on my personal enjoyment

1. Go-Busters
2. Go-Busters
3. Gekiranger
4. Go-Busters
5. Zyuohger