I agree with you on that one, the glasses are kinda meh
Also I think character-wise it's a little bit... sloppy (don't really have a better word for it) to take our complex main character and just turn him into an Arima copy.
I hope this is either an act or has some kind of deeper meaning to it, like how Kaneki so far has "copied" some behaviours of his abusers (his mom, Yamori, Arima), because I won't believe (or at least I don't hope) for a second that this is really the "true" Kaneki, despite how badass he seems