I find the Tank Mayhem Easy to be medium, medium is easy, and hard is, well, hard. All those rocket launchers, a Stag tank, regular tanks, humvees, and attack choppers... I still haven't completed it, but I came close, and generally have fun trying.
But it's nothing compared to the hard trafficking. I die within 30 seconds everytime, and my gang vehicle explodes. Maybe I just had the new ambushes spawning alongside the mission ones, I don't know. I just decided to put it off until I could upgrade my pistols and character to hopefully give me a shot.
I haven't gotten to the deckers.die mission, though. I despised that and the kinzie trail-blazing missions when I played the vanilla game, so I dread doing them again.