Okay, this one is going to be a bit rougher. I don't think there is a bad or even a mediocre episode in the mix here. Ranking this for me is going to be a bit tough. Well... I think I'll go with this:
Lesson Zero > Castle Sweet Castle > Castle Mane-ia > Too Many Pinkie Pies > The Ticket Master
Lesson Zero, to me, is Party of One done right. I know a lot of people love Party of One, but I find it to be just... alright. Lesson Zero, however, I find much funnier, and certainly the most entertaining of the crop we have today. Crazy Twilight is a treat to behold, and this episode may very well have Spike's best portrayal in the entire show. Gold star.
I'm a bit surprised that I'm putting Castle Sweet Castle here myself. There are some spots I find relatively average during the episode. It's entertainment to me is about on par with Castle Mane-ia. The reason it wins in the end, even if they could have been stronger, are the feels. Them feels can really endear an episode to me. That's the reason Sleepless in Ponyville is my favorite episode of Season 3.
I know that some people find Castle Mane-ia a bit bland, but for me, I find it plenty amusing throughout. I don't think there is a moment of boredom, even if there also any moments to make it stand out. This is one of my go-to episodes to point out that isn't anything special, but also doesn't have anything wrong.
Too Many Pinkie Pies has a good portrayal of Pinkie, somebody who really suffers when written poorly. Her clones might be crazy, but that is intentional here, and Pinkie should NOT be written like she is one of those clones. The solution of finding the real Pinkie is... really dark if you think about it too much. It's not last because I find it more entertaining than The Ticket Master (I keep using that word in this post).
Speaking of The Ticket Master, it is not a bad episode at all! Perhaps it is because it is such an early episode and I've seen it so many times, or maybe it is also still establishing all the characters and as such lacks much depth. Either way, I just find it sort of average to watch now. There's nothing that bothers me about it like Too Many Pinkie Pies, and yet... I feel like it has little personality compared to its competition. As I said before, when all the episodes are decent, it feels bad to put one in last place, but