Ranked- A mode for people wanting to test their skills and display them for the other people playing. Competitive, and for everyone wanting to play to their extent.

Unranked- A mode for people who want the same things as ranked, but they don't want to be ranked for it. Competetive play but without the same pressure.

Casual- A mode for people who want to play siege, but not at their best. If you are playing more for fun, or to win, then play casual. A sick day, or a vacation day, this is what you would play.

Why?To avoid the problems that arise when people who want to play hard, but not ranked, end up in casual and get all the little guys killed. We've all been at the time where you think: "Wow, that guy has 8 kills, why the hell is he playing casual?"This is a nice middle ground. Anyone who wants to play hard without the pressure of winning can join unranked. It keeps the casual players happy and the hard players from playing casual just because they want to avoid the pressure at ranked levels.

The people who join casual to tryhard on purpose will do that no matter what you do. The point of unranked is to get the people who want to play hard but not be ranked a place to play.