14 out of 20 people on a recent poll on the Power Rangers Union blog said that MMPR is overrated. I personally couldn't disagree more with the results and still think that MMPR S1 is the best among all Power Ranger seasons (season 2 was somewhat good, season 3 was so-so).
I can see why some Power Ranger fans tend to think that MMPR is overrated. The fact is that the majority of all Power Ranger fans are either hardcore MMPR fans or MMPR related fans (Tommy fans and Zordon Era fans). Most of the rest of the Power Ranger fanbase is made up of people who either like the first Saban era as a whole or the entire franchise. Some of these fans feel that MMPR's popularity takes away or overshadows the rest of the franchise. MMPR does admittedly overshadow the franchise as a whole (which has plenty of good series other than MMPR), so this is understandable. These are also the most likely fans who would visit Power Rangers Union blog as well. With that said, here's why I think MMPR S1 is still the best season ever in Power Rangers history (In Space comes in at a close second).
1. The Cast- Still, to this day, MMPR S1 and the first half of MMPR S2 has the best and most likable cast in the franchise history. Tommy is imo and many others, still the best ranger of all time. But Tommy tends to overshadow some of the other cast members on not just MMPR S1, but every series he's played in as well, including Dino Thunder. Jason, Zack, Kimberly, Trini, and Billy are all among the most favored rangers as well. In season 2, the MMPR staff didn't do enough to develop the new cast early on, except for Adam, who was the most popular of the new cast members. Saban would learn from this mistake and later on in Turbo, they made it a point to develop an almost entirely new cast early on.
2. The Zords- Saban really has Zyuranger to thank for this, but the zords in MMPR S1, as well as MMPR S3, are among the coolest zords in the franchise history.
3. The Music- Although the first half of season 1 consisted of basically only two songs, Go Go Power Rangers short version and Zords, the second half of season 1 as well as season 2 added some of the best songs in the franchise history, all of which were sung and composed by Ron A. Wasserman, a.k.a. The Mighty Raw. No other series matches up with MMPR's music, and most (but not all) of the good theme songs in the later years are by Wasserman.
4. MMPR set the franchise- If it wasn't for the popularity of MMPR, the series would never be what it is now. A near 20 year long franchise, which is hugely successful. Many shows can't even reach 2 years, let alone 18 with the new season coming up. Also, MMPR as has been mentioned many times on Power Rangers Union, was the gateway for many Americans as well as other people around the world to Super Sentai, Kamen Rider, exc.
Now admittedly, there are some weaknesses in MMPR. Season 1 still lags behind In Space and practically the entire Judd Lynn era in story writing. Season 2 as mentioned above didn't properly develop the new cast, and season 3 ditched a lot of elements that were largely successful in season's 1 and 2. But MMPR is still, among the best in the franchise history.