This game...it's actually quite good and a lot of fun, as long as you understand what you're getting into.
The RPG elements of the game are very light, because Battle brothers isn't an RPG, it's a squad based tactical sim, with some RPG flavor thrown in.
Yes, you can equip your team with armor and weapons, and level up your characters, but there's no story or campaign for you to go through. It's all just one big sand-box, and the freedom to do your own thing is unmatched. You will however be fighting a lot, and you will lose characters. This is the essence of the game.
So then let me tell you a bit about the fights, and maybe save you some headaches.
Learn to fight as a squad, not as individuals...or suffer losses.
Learn to swallow your pride from time to time and run. That's right, you will often find yourself in no-win situations, that's ok, recognize it and remember that discretion is the better part of valor.
Understand that equipment is very impactful in surviving, perhaps more so than leveling up.
Now throw in some events, late game crises, exploration, and a ton of randomness...and this is a game that will give you tremendous replay value.
P.S. Don't let the weeble-wobble looking guys turn you off, believe it or not, you quickly learn to love them.
Overall an excellent small-unit tactical simulator where terrain (elevation, LOS, etc) plays a role. If on discount, an absolute recommend.