Tier definitions:
S - Masterpiece (read this ASAP)
A - Excellent (read before you die)
B - Good (definitely worth reading)
C - Fine (read if you can get it from the library)
D - Bad (don't bother)
S Tier
The Stormlight Archive
Mistborn
The Emperor's Soul
Harry Potter
Percy Jackson & The Olympians
The Heroes of Olympus
A Tier
Ender’s Game
The Hobbit
The Lord of the Rings
Fablehaven
Dragonwatch
Les Miserables
The Count of Monte Cristo
A Tale of Two Cities
Unbroken
The Hiding Place
Seven Miracles that Saved America
1776
Holes
B Tier
Ranger's Apprentice
Warbreaker
Elantris
Bartimaeus Sequence
The Chronicles of Narnia
The Chronicles of Prydain
Beyonders
Pendragon
Alex Rider
The Inheritance Cycle
A Series of Unfortunate Events
The Legend of Drizzt
To Kill A Mockingbird
Frankenstein
Pride and Prejudice
Sense and Sensibility
Persuasion
Romeo and Juliet
Othello
The Taming of the Shrew
Puddn'head Wilson
The Giver
The Diary of a Young Girl
C Tier
The Kane Chronicles
Magnus Chase & The Gods of Asgard
Skyward
Psion Beta
Inkheart
Artemis Fowl
Charlie Bone
The Thief Lord
City of Ember
Magyk
Wings of Fire
Shadow Children
The Hunger Games
Divergent
The Spiderwick Chronicles
The Maze Runner
Leven Thumps
Gregor the Overlander
The Hitchhiker's Guide to the Galaxy
Great Expectations
The Scarlet Letter
Cry, the Beloved Country
The Jungle
Uncle Tom's Cabin
Of Mice and Men
The Adventures of Huckleberry Finn
The Mysterious Benedict Society
Diary of a Wimpy Kid
The Book of Mormon Sleuth
The Magic Treehouse
The Outsiders
Things Fall Apart
The Good Earth
The Picture of Dorian Gray
D Tier
Tennis Shoes Among the Nephites
1984
Animal Farm
The Great Gatsby
Nickel and Dimed
An American Childhood
The Devil's Arithmetic
Cold Sassy Tree