How steep is the learning curve in this game? Can you make a contribution on day 1?

I'm thinking of getting into this game, and I'd just like a little information on what to expect, if you'd be so kind.

Does this game have a very steep learning curve, where you are a burden to your team for dozens of hours, or is it easy enough to contribute right away?

Is it like Battlefield, where you can be useful by just standing in the right place and dropping supplies (for example; I'm not really asking whether this game shares mechanics with Battlefield).