My best moment was running across that ???? enemy in the small back area of I believe the 4th story mission, and with the help of a random player, managed to kite him away and run past him to get the Ghost pickup that was in the room he guarded. My worst moment was (well, lots of the same experience) was when, due to my previous internet situation kicking me off PSN every 40 or so minutes, I was disconnected when playing with a random fireteam against Sepiks Prime (hard difficulty); Sepiks had maybe 30 seconds to go before being defeated, and I had no extra free time to replay the mission. It remains the only thing I hadn't done in the beta that I set out to accomplish. But here's to kicking that giant evil in the eye-balls come 9/9!