Battlegrounds is a game of luck
It has nothing to do with skill
1 - you have to get lucky to own all the main defenders and counters, and the materials to rank them up
2 - you have to get lucky you don't be drawn to fight whales
3 - you have to get lucky you get to pick your main defenders and counters
4 - you have to get lucky your opponents don't get to pick their main defenders and counters
5 - you have to get lucky the AI is not obnoxious (doesn't block all the time, throw specials etc.)
And, after all that, if you still lose, you have to get lucky the opponent doesn't taunt you with a laughing Loki