The combat is excellent; most people just don't experiment or try out all the different mechanics.
The vehicles are good, people just try going up their very first steep snowy slope in the Truck, and when they can't hold forward in a straight line, they bitch and moan.
Roads and Ziplines while very satisfying to buid a fully connected network, ultimately are trash and make the game extremely boring, taking the gameplay out of the game.
Metal Gear had the tranquiliser gun; well this game has the Tranquiliser Grenade Launcher. If you are too trash to stealth properly, just use this, it makes all camps a joke.
For BT bosses the game literally tells you the best way to take them out; shooting through blood clouds onto blood patches, and yet shitters ignore it.