At first, it looks awesome, with interesting premise (secret ghoul society among humans).
But as story goes on, we get more and more shonen elements... And less and less seinen mystery
And plotholes... Oh, man, those plotholes... (still not as bad as Death Note, ugh...)
If story went as it has in first few volumes it would get much higher score, but adding multiple types of kagune was first step towards bad parts, then we get to know ghouls are almost wholly immune to normal weapons (unless you stab them in mucous membrane), and they are only vulnerable to quinques, weapons made from ghouls (plothole: how did they made first quinque? some nice ghoul sacrificed himself?).
Then we get inconsistency in treatment of ghouls...
Since start of manga it has been made clear that ghouls are killed on sight, as soon as someone is confirmed to be a ghoul, they move in for a kill, as seen with "mother ghoul", no attempt was made to even offer capture. But late in manga we find out there is a "ghoul prison" where they kept multiple highly dangerous ghouls...
Errr... I quite don't get logic behind killing peaceful ghouls and keeping violent ones alive... At least that priest ghoul was informant, but that "fanboy" ghoul... Why keep psycho like him alive?
No logic...
And fights...
It's like watching some mecha manga, but instead of mechs and weapons we get kagune and quinques...
At least kagune designs are plausible, but quinques...
I've seen bad weapon designs, but Tokyo Ghoul tries really hard to get into top 10 worst weapon designs...
If this manga tried less to appeal to shonen genre, with flashy skills, err... kagunes and weapons, err quinques, and kept it's starting premise of hidden ghoul society shunned by humans (and not that CCG Anteiku war...) it would actually be good.
Art style is actually good, especially covers.
Although, for a "bloody" manga, it's quite tame...
Shame...
And prototype chapter was excellent...