Theres no real point in having 1 crit quint though, 3 percent change isnt much more than the ~2% that a crit mark would give you and you would sacrifice less consistent damage.
-shrug- just my thoughts, it's your guide so keep it if you think it is worth it, its your guide not mine xD

@extradelicious, i did explain why I have 1 crit quint, and it was to compliment his passive more. His early game is pretty bad, so if you manage to get a lucky crit you would have more lane presence. Thanks for everything, i will add everything shortly.

The good: looks nice
I can see you put in effort.
Mastery Section is explained well

the bad:
theres no explanation of how to really do anything.
why have a crit chance quintessence?
No demonstrative full build.
No sustain items
No last whisper or BC (yomuus is good but armor pen is really the **** on yasuo)