1. Season 2: This season has many of my favorite episodes like "Lesson Zero", "Hurricane Fluttershy", "Sisterhooves Social", and "Ponyville Confidential". There are only 4 episodes that I don't like. Everything that worked about season 1 was pushed up to 11 with better jokes, stories, and characters.
2. Season 3: Yeah, I find season 3 to be underrated. Even my least favorite episode here, "Spike at Your Service" still had a few good jokes. The only other things I didn't like about the season were Discord's reformation and the moral in "One Bad Apple". Everything else was fantastic, especially "The Crystal Empire" and "Magical Mystery Cure".
3. Season 6: Looking back I realize that there were a lot of really standout episodes like "Gauntlet of Fire" and "The Saddle Row Review". The reason this season isn't higher is because many of the episodes don't have the same punch that a lot of seasons 2 and 3 episodes have. There are too many episodes like "Applejack's Day Off" and not enough like "No Second Prances". Additionally, while I thought Starlight's arc was done well enough, she would have benefitted from more episodes about her or at least more appearances as a side character.
4. Season 4: This season is interchangeable with season 6 in terms of quality, but this was a much less consistent season. The reason season 6 is better it didn't hit the same lows as this season did with "Rainbow Falls" which was a complete mess from start to finish. Although along with "Rainbow Falls", the season also had "It Ain't Easy Being Breezies", "Pinkie Pride", and "Inspiration Manifestation".
5. Season 1: This season does not hold up well looking back. Episodes were much simpler and Twilight's presence held back episodes like "Green Isn't Your Color" from achieving greatness. Even so, the season holds a purity and charm that no other season has and episodes like "Party of One" and "The Best Night Ever" still hold up as some of the best episodes of the show.
6. Season 5: There were a lot of terrible episodes in this season like "Do Princesses Dream of Magic Sheep", "Crusaders of the Lost Mark" and "The Mane Attraction". This season tried to take itself more seriously than other seasons and it rarely worked with more "Tanks for the Memories" than "Brotherhooves Social". One the other side though, there were fantastic episodes like "The Cutie Map" and "Make New Friends But Keep Discord" to balance it out to a meh season.
7. Season 7: This is the only season I dislike. The worst episodes were some of the worst of the series and the best episodes didn't compare to the best of other seasons. This season felt like the writers ran out of ideas as this was the least charming and least entertaining batch of episodes of the entire series.