My opinion is basically almost the same than everyone else here.
EQG consumed a lot of good resources from what was a good show in that time resulting in a forgettable spin off imo - seriously, I have watched the movies and barely remember what they were about - and at the same time a mediocre FiM season which started the downfall of the show.
Also while the pony show itself attracted several great artists in its own, EQG mostly attracted literal kids from DA who constantly flood the pony sites and imageboards with shit quality art and hundred of edited screencaps that have very low effort or any at all.