Battle angel alita - 9 (out of 10)
Blade of the immortal - 8.9
Ranma - 8.9
Fullmetal alchemist - 8.7
Naruto (before the three year skip and the art started to suck hardcore) - 8.4
Battle Royale - 8.2
Vagabond - 8.3
C.A.T - 8.2
20th century boys - 8.4
Monster - 8.4
ichigo 100 % - 1
black cat - 1
Bleach - 4
deadman wonerland - 1.2
claymore - 5
ashen victor - 8
ares - 8.2 (saved by the interesting art)
not all though. And bleach is totally overrated.
Mind that I mostly compare the mangas to their genres, not to each other.
Well now I know one person whose taste is about the opposite of mine...
But I Agree to the first one, Battle Angel alita: 9/10. For me, thats about right as well.