And on a more fun note, Randomizer...
High: Acolyte & GPR Geth Trooper Soldier. LOL@Randomizer! I should've used Cryo Ammo for old times' sake, but I went with Disruptor ammo because the enemy was Cerberus.
Then PurpGuy decided to go AFK on Wave 6 Devices which made things difficult. And then I got stabbed on Wave 7, but fortunately N7Lady spawned into the game just as I was dying, and was able to solo out not only Wave 7 but also Wave 8 when the still-AFK Purp and the not-AFK-but-playing-that-way me, both managed to die. On Wave 9 we all managed to stay upright and hey, the game got a lot easier with all three people contributing!
Next was
Incisor Human Female Engineer. I have her built with 4 ranks Fitness (700 shields), and I normally put on Cyclonic II or III to get to 1000 or 1200 shields. However the Incisor requires Stabilization III in order not to suck, so I figured this would be... interesting.
Versus Reapers on Ghost. And surprisingly, I only died once in the entire game! I really wanted a personal 10 Waves Survived, but some Marauders took me down on one of the later waves. Ah well.
I did get 20 Headshots with the freakin' Incisor. Admittedly most of them came on the early waves when I would Overload Cannibals and Marauders for easy shots.
Low: Ugh, two games in a row with Batarian Sentinel with not-so-great weapons.
First, the Katana, vs. Collectors on Jade. There is really nothing to recommend the Katan: slow re-fire time, piddly damage, small clip. For reference it takes 2 Katana headshots to kill a regular Collector (trooper) and 3 Katana headshots to kill a Collector Captain. Oof. Anyway we managed to extract, no thanks to me and my Katana.
Next, the BPP and Indra, vs. Cerberus on Reactor. BPP with stabilization is actually decent and lore appropriate on the Batarian, but I just couldn't accomplish anything in this game. Later on I switched to the Indra but it didn't help. Somehow we managed to extract, but it cost me all 6 Gels and all 6 Ops Packs.