Manga that I've read (rated from the best to the worst):

1. Doraemon by Fujiko F. Fujio
   
2. Detective Conan by Gosho Aoyama
   
3. Inuyasha by Rumiko Takahashi
   
4. Rurouni Kenshin by Nobuhiro Watsuki
   
5. Detective Kindaichi by Kanaki & Sato
   
6. Ranma 1/2 by Rumiko Takahashi
   
7. Maya - Glass Mask by Suzue Miuchi
   
8. Chibi Maruko (Momoko Sakura) by Momoko Sakura
   
9. KID 1412 by Gosho Aoyama
   
10. Yaiba by Gosho Aoyama
    
11. Sailor Moon by Naoko Takeuchi
    
12. Esper Mami by Fujiko F. Fujio
    
13. Pacman by Fujiko F. Fujio
    
14. Time Machine by Fujiko F. Fujio
    
15. Maison Ikkoku y Rumiko Takahashi
    
16. Revolutionary Girl Utena y Chiho Saito
    
17. Royal Crest (Ouke no Monshou) by Fumin & Chieko Hosokawa
    
18. Chinba Mouse by Fujiko F. Fujio
    
19. Faraway Planets by Fujiko F. Fujio
    
20. Hero of the 21st Century by Fujiko F. Fujio
    
21. Ninja Hattori by Fujiko F. Fujio
    
22. Ninja Quytaro (Obake no Qtaro) by Fujiko F. Fujio
    
23. Lum by Rumiko Takahashi