seems to be harder than the other games for me. i use legendary with thunderskull on for a 4.8x. ive tried numerous varieties but i always come up short on score. as where playing legendary i run the risk of losing time and getting my multiplyer to 0.0x for everything for the rest of the mission. what are you using?
I also got another 3 players to play with me at the same time, the extra fire power helps