Krogan support came at a high personal price to me.
I am using vanguard for a rushed playthrough, as I just want to see the ending so I can judge for myself whether it has been ruined or not. Then using infiltrator for Insanity playthrough as I've grown to love it.
On multiplayer, me and friends finally managed to finish Silver challenge, 3 players, 2 infilitrators and an engineer! It was awesomely intense, trolling geth with the sabotage ability really proved to be useful, bring on the Gold challenge.
Also what packs do people buy in multiplayer? I was considering saving for spectre, but it doesn't really seem worth it in terms of equipment like gel, rockets etc. I just brought a ton of the beginner packs or w/e, the 5k ones, and managed to get my assault rifle up to 10! And sniper is at 7 atm, with pistol and SMG trailing at 6, definitely a good way to upgrade the weapons.
Disconnect and self destruct, one bullet a time.