I believe it has gotten better over time. The reason Twilight was made an alicorn (other than Hasbro of course) was for more world building, which the show needs. I also think having a full season story arc was a step up for s4 over previous seasons. Then there's Twilight's Kingdom, my personal favorite episode, to bring it all together, Other than some episodes, which are just like, there's a viillian, lets banish it, THE END, TK has a clear story and and an incredibly quotable villain. I do, however, think S3 was a miss and seemed rushed though. MMC made no sense to me. Why did Celestia give Twilight a spell that Celestia prob knew would en up causing chaos!? But I believe S4 improved over S3 alot and I think the show will just keep getting better and better,