Thanks for the offer, got the G3 unlocked after doing the missions on hard difficulty. The third mission is just comedy gold, there's so many bugs in it that I can't even count. Sometimes when you're supposed to man the 50 cals on the humvees, the game just randomly says NOPE and you gotta restart the mission as you can't enter the cars. Shortly after that while driving to the final battle of the mission, the entire map just ends and you fall to infinity.
If by some magical wonder you do reach the final battleground and find a nice hiding spot, the enemies run through the walls, stab you and your friend, run back through the wall, and you have to restart.
One would think all these bugs would be fixed now that the game has been out for over 6 months, but I guess this is just typical EA. Good thing the multiplayer is pretty decent.