It's your typical milsim shooter, slow, clunky, die from someone looking at you funny. But it is a lot of fun, imagine if battlefield toned down the ridiculousness factor and was actually as "realistic" as some people say it is.
I enjoyed this a little bit more than Arma 3, from a purely get on with some friends and play for a little bit perspective. (I feel like Arma is meant more for massive set pieces and long missions). But I highly reccomend you play it with some friends or you find a server that meets what you want to get out of it (there are those who treat it as if its real life, and then there are those who just want to do some shenanigans, both can be fun just know what you're going to get).
ARMA is meant for whatever you want to set it up for. I used to have Fulda Gap grade armored columns and fly an A-10. It all depends on the mission. You can do everything from mild to wild with ARMA. Look up ShackTac on youtube, specifically Dyslesxi (probably spelled wrong) and watch some of his videos. It's pretty awesome.