Honestly, its pretty good. You should revisit it if you have the time. Twilight grows over the course of the seasons, as does the other characters. There are some great villains that come up and some even turn the corner.
The Mane 6 is the A team
The Cutie Mark Crusaders are the B team (they do eventually get their Marks once they figure out what they were meant to do and have been doing).
Then there is a C team of reformed villains that step in at least once try to save the day.
Then there is a D team that are students of Twilight, which was a little awkward at first but really freshened the story.
When one of the villains made a heel face turn (I think it was season 6 or 7), I kind of felt like the show jumped the shark, but as I kept watching more, they really came into their own and I am glad they did what they did with them. I am worried that Season 9 will be like Parks and Rec season 7. Like, it probably could have ended with the previous season but "lets push forward." We'll have to see for ourselves.