As much as I love Mad Max, that is significantly more grindy than this game honestly.
As for you hating the map, you if you push to mission
you unlock the next area which is a nice change of scenery and plays a bit differently as it's not as mountainous.
If you're bored of your current playstyle why don't you change it up a little bit. Maybe try using Riot SMG and Riot shield maybe for a bit different. Then unlock a sniper rifle, use that for a bit. Then maybe grenade launcher/rockets only or drop in a tank to use. Might not work for you but I had a blast when I changed it up like that.
Or you could just rush the main storyline and ignore the side ops. Side ops is where the grind enters imo when you're hitting the same areas over and over. The main storyline offers a lot more variety I've found.