Gangplank continues to be nerfed
Before my main post: I expect to get a decent chunk of hate on this post considering everyone's obsession with justifying nerfing a high pick-rate champion in competitive games, but hear me out
Really? Yes he does some very very nice damage (Love getting those massive crits on enemy carries hawhawhaw), but then you have to consider:
Gangplank has ONE shot to do a large chunk of damage before he must close into melee. Ranged ADC's easily out-DPS him in fights because Gangplank in teamfights must either:
a) Build a bit tanky to be able to fight in melee and therefore lose out on some damage b) Build full damage to megaburst with barrels but have to avoid melee combat in teamfights until all CC is used
Gangplank is a melee champ with only a little bit of mobility and his huge ranged damage is literally just that one shot and he has quite a lot of counterplay. Compare that to very mobile champs like

who can deal close to his level of damage but with a lot more mobility and arguably easier execution. Gangplank's advantages over them range from slight, to basically none
For the record: Yes, I'm aware his current PBE nerf isn't god-awful and he'll probably still be in a good spot after his nerfs, but this is exactly what happened with
and
Both got hit with continuous nerfs that turned them from top tier, to situational picks, to VERY situational picks, to "Why play them when 'X' can do the same thing but way better and easier?"
Gnar and Maokai are picked over Sion 90% of the time as tanks
Ahri and Diana (Who was considered trash a few months ago) are picked over Kassadin as assassins
EDIT: Gangplank's PBE nerfs are harsher than I initially thought! I take back my statement of how he'll probably be in a good spot to how he MIGHT be in a good spot
?
and reduce irelia's amount of true damage she can pump out if she does force extended trades, irelia can compete at level 9 though as irelia does well even if behind, so the only trick to this is punishing her pre-6 and shoving her out of lane and not letting her force extended trades on you in a safe spot for her