Disclaimer: These have nothing to do with how much I liked a show or thought it was objectively good. In fact, shows that were my favourite may or may not have great OSTs.

5/5 - PERFECT

• Uchuu Kyoudai
• Chihayafuru

4/5 - GREAT

• Meganebu!
• Nagi no Asukara
• Natsuyuki Rendezvous
• 5 cm per second
• Kotonoha no Niwa
• Nerawareta Gakuen
• Detective Conan
• Mushishi
• Free!
• Honey and Clover
• Kimi to Boku
• Gundam Build Fighters
• Guilty Crown
• Gundam Unicorn

3/5 - GOOD

• Valvrave
• Sakamichi no Apollon
• Shingeki no Kyojin
• Sword Art Online
• Noragami
• HAL
• Ookiku Furikabutte
• Major
• Kuroko no Basuke
• Yowamushi Pedal
• Utapri
• Shirokuma Cafe
• Psycho Pass
• Nodame Cantabile
• Evangelion
• Kuroshitsuji
• Karneval

2/5 - DECENT

• Nisekoi
• Giant Killing
• Hyouka
• Tiger and Bunny
• Tsuritama
• K-Project

1/5 - NOTHING SPECIAL

• Anything I've seen but have not been on this list yet, not necessarily bad but not memorable enough