I'm a pretty big J-Drama fan. I'm glad I found this topic. Anyways, here's what I've seen or am currently watching.
Currently Watching
Zenkai Girl
Keitai Sousakan 7
Completed (with my rating)
Buzzer Beat 9/10
Code Blue Season 1 8.5/10
Code Blue Season 2 8/10
Dekichatta Kekkon 8/10
Densha Otoko 8/10
Dragon Zakura 5/10
Fighting Girl 7/10
Fire Boys 7/10
Friends (Japanese and Korean co-production) 9.5/10
Fugoh Keiji 4/10
Galileo 7/10
Good Luck!! 7.5/10
Hitsudan Hostess 9/10
1 Litre of Tears 9/10
Ikebukuro West Gate Park 6.5/10
Kamisama Mou Sukoshi Dake 9.5/10
Karei Naru Spy 7.5/10
Kimi Ga Kureta Natsu 8/10
LADY- Saigo no Hanzai 8/10
Majo no Jouken 8/10
Mop Girl 7.5/10
Moto Kare 6/10
Otousan 8.5/10
Papa to Musume no Nanokakan 9/10
Pretty Guardian Sailor Moon (if this counts) 8/10
Remote 9/10
Rookie! 6/10
Seito Shokun 9/10
Shibuya 15 8/10
Smile 9.5/10
Strawberry on the Shortcake 10/10
Summer Snow 8.5/10
TEIOH 5/10
To Heart 7/10
Uramiya Honpo 8/10
Uramiya Honpo Reboot 8/10
Yama Onna Kabe Onna 6/10