A very overrated pair of garbage episodes. To elaborate:  
-Twilight does not engage Tirek until he destroys the Golden Oaks Library.  
-Her friends here are interchangeable with literally any other pony and even inanimate artifacts.  
-Give Tirek motives beyond destroying Equestria and he is a much better villain.  
-Without pony magic to control its forces of nature, Equestria will devolve into an uninhabitable disaster area.  
-Everyone can recite the lyrics to Winter Wrap Up and This Day Aria, but not You’ll Play Your Part or Let The Rainbow Remind You.  
-The episodes are so dark that the target audience of 6-year-olds feels like an afterthought. Robbie Rotten even hid this two-parter behind his curtain: https://www.youtube.com/watch?v=X2gnWxRd9qA Don’t let your kids watch it, indeed.  
-Tirek’s second-to-last form is very badly proportioned.  
-If Celestia had sent the Mane 6 instead of Discord while Tirek was still weak, the episode would be over much faster. One of them could also shut Tirek up when he tries to manipulate Discord into handing him all of Equestria’s magic, like how Darth Vader does here: https://www.youtube.com/watch?v=iPVdxi-2-cI  
-Having a good guy who can stop everything with a snap of his finger is a boring detriment to good storytelling.  
-Tirek is so overpowered, the Deus ex Machina of Rainbow Power is literally the only reason why FiM has a fifth season.  
-If Tirek escaped back in It’s About Time, this implies that he just stood there and did nothing for two whole seasons.
 
Meme by Mr. Enter