pretty much when i'm not tired of playing the game for the day, and that's with any mode, not just mercs. though i'm not very good at mercs (jake: power counter, 1.3 mil urban chaos, boss killed at 20-30).
Even though it's frustrating, annoying, and filled with BS, I just enjoy grinding mercs. I focus on playing as fast as possible. It makes me forget about anything else, at least for a little while.
I don't have any conditions when I'm at my best. Some days I'll feel ready to play, but when I start, I'm immediately off my game, missing easy counters and not aiming well. Other days, I'll be tried, but when I start playing, somehow my aim will be dead center and countering will be fluid.
It's fun when I can get into a rhythm of dog and leaper countering. But after a while, my reaction time slows to the point that I get jumped on even though I get the counter chime. That's when I know it's time to take a break or quit for the day.
It depends on my brain and reflexes sometimes I guess. Sometimes I can counter almost everything even every dogs jump at me I can just 'swoosh' at them but sometimes I just because an idiot and can't even counter a zombie slap. I mostly get nervous whenever I get to 120 combo and above and when I was surrounded by tons of zombies and a napad I lose control and play badly but pick it up quickly as I told myself not to lose the combo and just a few more to go.
But I get extremely good whenever I join an counter freaks like those 1.3 million freaks. I guess it's the pressure that makes me do good but I always messed up when trying to set up counter on those firearm zombies then they will KICK me when I died. Every damn time without fail whenever I join an expert player unless they are extremely patience with me like there's 1 time when I just played mercenaries for the second time, I died for 3 or 4 times but this Japanese guy keep restarting until we got a 1.2 million, and I think that was really great cause I don't even know how to set up a coup de grace or a counter but we get such high score.
^ Did I run into you on survivors Vodka? I think it was on MtD and you were Sherry and I was Chris.
if it's on ps3, then no, as i am an xbox user (but i like visiting the ps3 board because it's not as dead as the xbox's).
if on xbox, maybe you did, as i /do/ pick sherry as my main character except for team match urban chaos (since i have no use for her there now that i already got my 99 with her). if on xbox, would i recognize you from your gfaqs user name?