Killzone 2: Objective Points vs. Mission Points?

Objective Points = Mission points.

What you are referring to is Total Points (The last column in the stats). Those take into consideration: + Mission points + Kill Points (No of kills * multiplier, based on headshot or other ) - Penalties

So you have:

-> Deaths

-> Penalties (team kills + suicides)

-> Objective points (surviving an Assassination, making an Assasination, blowing up an S&D...)

-> Opponents killed

-> Total points (opponents killed with multipliers and objectives are taken into consideration - penalties)

This was also discussed here:

https://www.neoseeker.com/forums/32245/t1423204-confused-with-score-system-multiplayer/