I remember when marking targets helped. A little, sometimes. That was back in about 2.0 or 2.1 when I had an i55 weapon on tank compared to DPS i70, i80ish. But since then, you get good on tank and it's pretty much impossible to lose hate.

Exceptions would be 1) the tank screws up, like an Overpower hits 5 targets and misses a 6th. 2) the DPS screws up, like using single target attacks and heavy offensive cooldowns while tank is doing area attacks. Or 3) better gear on DPS.