Garen.

Every time the enemy team has a Garen(somehow), the game just slows down to a crawl. Every time our team has Garen(somehow), the game feels way too easy. Just get Garen fed and you will always win.

You can't push Garen out of lane and go roam, because of his passive. You can't teleport to any other lane, because Garen will push the lane with his E and drop your tower with his Q. You can't roam, because if you're successful with your roam, you get punished. You need to repeatedly gank and kill Garen, if you want to make sure he stays behind. No other champion I feel requires this much babysitting to shut down. Late game he is way too hard to kill. If he get's low, he just runs away and regenerates his HP back to full. This is made worse with the warmog's passive. Late game his ult will straight up kill a squishy if they dare to go lower than 45% HP. Even without any damage items. One crit from an adc against one of your squishies will allow Garen to just delete them. If Garen gets ahead, you will need a raid group to fight him. If your raid fails to kill him fast enough, he will summon four adds to finish you off.

Something needs to be done about this champion. Every single time I see a Garen in one of my games, all happiness and joy gets sucked out of my soul.