List a number of manga you read (or have read) and anime and give them a rating, you're free to elaborate on why you gave the works that grade, but just for consistency lets use a 1 - 10 as grading scale.

Parenthesis for opinion influenced scores (nostalgia and such).

Anime
[list][*]Berserk: 6/10
[*]Claymore: 8/10
[*]Gilgamesh: 7/10
[*]Great Teacher Onizuka: 7/10 (10/10)
[*]Record of Lodoss War: 6/10
[*]Rune Soldier: 7/10
[*]Slayers: 3/10[/list]

Manga
[list][*]Bastard!!: 4/10
[*]Berserk: 9/10
[*]Claymore: 5/10
[*]Great Teacher Onizuka: 6/10
[*]Naruto: 6/10
[*]Pokémon [Red's arc]: 6/10 (9/10)
[*]Rurounin Kenshin: 7/10
[*]Yu-Gi-Oh!: 7/10[/list]