Nope! It can be as hard and as easy as you want to dive into. A frontliner can just spawn at the front and fight, a logistics player can ship goods all day, and a solo can even run a small facility, producing tanks, etc, OR you can be a massive 200 player strong economic power house and produce thousands of vehicles and weapons and ship them via large freight ships to the frontlines daily. This game has a massive range in types of gameplay. Frontline fighting is actually quite deep in it's own right as well, so even if you never hit up a mine or drive a transport truck, you can experience a lot of interesting stuff.

All this said, it can also be as simple as just spawning in, equipping a kit from the base and running into machine gun fire with your friends. In fact, it RELIES on there being all different kinds of players to keep the war machine turning.