These players choose HC mode in Battlefield 3 franchise, because we don't want 3P Camera, auto healing, Friendly fire off, Killcam, Spotting! We love a honestly/real hard fight. We play the game the hard way!

Just look how many bullets you need to kill 1 person that dont look real, hardcore is just like the campaign. Getting spotted the moment you come out the base and it will never really go's away.
3p tanks that see everthing around them, jets that fly all the time 3p camera. I trow grenade/ C4 in a room and team mates just jump in that room before it even explodes that is bs! People just drive over you and push you around. If i see a person then i have to find him and not press Q and go for a easy kill.
Prone in the shrubs, I haven't moved for a while 1 press of the Q key and you are spotted with your nice Camo...wtf. Better all this off and air radar.
These are some examples of how it works in normal mode. Classic mode Battlefield 4 is the best way to play Battlefield, but that is not in BF3.