Two Picks I am Really Getting Tired of Seeing

These are good points, but the zone control is relatively weak compared to a lot of other champions that could be picked. It has a very distinct counter. However, this combined with his global presence is something very few other champions provide, but he isn't super great at either of them. While having both and not being great at either is good because it gives you more way to play around him it seems to me that it is typically better to be at either end of the spectrum and not right in the middle. Champions with better zone control can typically keep their opponent under tower allowing them to roam and make plays around the map while their lane opponent has to stay under tower or risk missing a lot, and champions who have a better global presence like Twisted Fate (who also comes with much better CC) are more likely to be able to pull off the plays that will keep them from getting behind while roaming.

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Gangplank just has a large number of assets. Global ult, Grasp/Sheen + Q, 1.2k AoE shredding, etc. It makes him a little too strong, even if he's not played very well.

But yeah, I hate Quinn into Malphite. Reminds me of Darius into Gnar/blind Darius at Worlds, people kept doing it and kept losing in the pick/ban phase.

Well, huni beat malphite as quinn against c9

Quinn into Malphite isn't nearly the same thing as Darius into Gnar.

1. The lane is closer for Darius vs Gnar at all times. Quinn pre-6 has a large advantage in the lane due to her ranged advantage and auto attacks costing no mana, while post-6 HEAVILY favors Malphite due to his ult to close the gap and burst Quinn. Darius vs Gnar favored Gnar slightly early, and a large amount after, but not to the point where you can't lane at all. Quinn can't lane vs Malphite post-6 anytime his ult is up. Quinn HAS to roam, which Huni did pretty well against C9.
2. Darius had massive utility and lategame scaling. Sometimes it doesn't matter if you outlane Darius into the floor, he'll still be a respectable teamfight presence if played right or if your team slips up. I had a Darius at something like 0/6 at 20 minutes with at least a 50 cs lead and he still triple killed my team when they ambitiously invaded the enemy jungle (and I got a 3 man ult). It was like a 5 for 1 or 2 trade in their jungle. We went on to win the game anyways, but at the professional level Darius won't end up 0/6. So he'll be much scarier. Quinn on the other hand doesn't require the same level of respect. Yes, she can still pick people off randomly and snowball off of that, but lategame you'll still make her (and her team) shit their pants everytime you press R (whereas it took more skill to do that with Gnar).
3. Even though Darius lost lane in nearly every game against Gnar, he had a greater lategame impact more often than not. Gnar almost always dunked Darius in lane but Darius still had a 60% winrate or something in those games. I don't know Quinn's winrate against Malphite in professional games, but I'm pretty sure it's abysmal. There's like no win condition for Quinn other than fake a split push then rotate mid and somehow blow everyone up before Malphite can get there (which boils down to: team is fed, pray Malphite wastes shit on me 1v1 while team steamrolls or bait Malphite to the side lane then join team as they steamroll and you watch). In Darius vs Gnar, you still had the option of 3 man grab into something like Viktor blowing everyone up.

She's good and a meta pick, but everyone picks her into malphite which is a matchup quinn will eventually lose.