A good charger player can destroy the whole other team almost singlehandledly, as you'll surely find once you meet one or if you play ranked and manage to get to the higher ranks. In a map like Moray Towers chargers can pin the enemy team and stop them from progressing past the middle. It was the same when Splatoon released, everyone was saying roller was OP and charger was shit, until people started learning how to play them. Chargers right one have the disadvantage that they require a good knowledge of the map, while faster weapons can just jump into the fire and act on instinct, but in a few days we'll start watching some maps get completely dominated by a good charger.