While I'm happy to see someone supporting the idea that Gangplank does not have to go full crit to be good, there is still a lot of crit there.
I'll always miss the old critless bruiser GP...
As for the guide you need a bit more text. You've got all the basics available for someone who has some experience, but you need more for those who are brand new to GP. Explain what you should do at the different stages of the game, when against various ranged/melee matchups, and how you should be adapting to some general situations that may come up.
Above all explain the difference in playstyle for being ahead of your opponent and being behind your opponent. It's a very important distinction.