Casual is, well, casual. Nobody should expect your average team to be full of the biggest and sweatiest soldier mains the world has ever seen. More often than not its filled with three top players and everyone else just messes around/goes off and plays whatever they feel like while only sometimes engaging with the objective. If there's a steamroll though then most players (regardless of skill) will usually join in. But I've noticed that more often than not most casual teams are missing a medic. The teams that steamroll/play moderately well will typically but not always have at least one or two medics. Coloration doesn't equal causation I know. But why do most players avoid medic when he can make such a huge impact on the game as opposed to a 4th spy?