I've played Seoul 3 on different difficulties, with different persons, with different tactics... and always we get:
-10% -> 90% final rating
Ehm, what the he... Honestly, we haven't knocked any civilians or enemies, killed anyone, got spotted, completed all objectives including bonus ones (and no bodies spotted). And still -10. Very strange. (And I use v1.05 ofc)
Anyone else with same experience? What are we doing wrong? Has anyone really got 100% in that map? Is that known bug?
It has been a while since I played that one. What does it say you lost points for? Two of the bonus objctives were 1) rescue the pilots and 2) to destroy the tanks. You can lose points on the tanks if an of the guards are too close to it when you take them out (usually the second tank). They sometimes get injured or killed in the explosions and you get penalized for that- it would say something like enemy injured or killed in the stats.
Oops. I see you are asking co-op. Haven't played that. Sorry.
I vaguely remember it, but I don't remember the score. The guys I've played with though didn't focus on score, just fun, like me so we never tried to get 100% on anything. Sorry.