Well as a total newb to the series, I got my A$$ handed to me getting killed maybe 12 times with zero kills of my own.
Infantry was great and intense, tho I saw one guy who I thought was afriendly with no name tag (he was window MG) -so I shot and got penalized for low honor. Not so much a learning curve here but you definitely need to choose your movements wisely -which apparently I was not.
Next, a little tank action and coming over from Arma, this was a lot different. First off, I got point blank behind a russian tank but both shots richochets off his sloped armor and he turned and killed me. Not sure how to go about that one.
Similar to Arma tho my AI gunner was oft slow to fire and I'm not sure how to switch to gunne myself. Tanks had great, visceral feel and excited to get better at them.
Overall so far, I really like the immersion created by chatter, weapons sounds and scenes - just need to get better. Alot better.