I noticed there's a pattern where the last book in a series or trilogy ends up letting you down. So here's a list of series endings of disappointment and perfection alike.

Awesome/Perfect/THE BEST ENDING

• The Raven King (never have I read a more perfect final book)
• The Last Olympian (idk I remember it great)
• The Amber Spyglass (mah tears were endless)

Disappointing/Why/#justno

• Harry Potter and the Deathly Hallows
• The Crown (if we count #5 as the ending of The Selection series)
• Isla and the Happily Ever After (they are connected so)
• The Blood of Olympus (had good parts but nah)