First off I appreciate the response! I just have one more question, isn't ADC the role meant to deal with the tanks? If GP can one shot squishies AND kill tanks, whats the downside to playing him? I'm not being obstinate, just curious. He does well in lane last time I checked as well, but I could be off on that.
In general, melee champions tend to have either poor target access (fighters) or poor sustained damage (assassins). Gangplank is certainly a bit of a special child, but I'd consider him a caster. Technically he has a melee auto-attack but he's really all about Q/E/R for damage and occasionally autos things when he's forced to, but you're not going to see him right-clicking a Lux any time soon.
So as a mage, yeah he's a bursty boy with decent target access and a big unreliability problem via barrels. If he hits the barrel chains or does a 5Head setup, then he's going to be rewarded. But the oneshot builds have at most Trinity Force or Shieldbow for durability so that champion isn't much more durable than the Ashe he's killing.
Gangplank's weakness is that he doesn't actually win all that often. ~48% win rate. So as much as he has really high points, it's sort of a montage problem: Sometimes he oneshots and looks like the best champion in the game. But that isn't happ...
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