Huh, so from my debut games for my new commander decks: my angels just seemed to run into some bad luck with manabase draws, but that said, I think I DO need to skew a bit more heavily towards white (it's R/W/B with roughly even distribution and lots of duals and junk.) Actually got to terrorize the board a bit, but then took that guy who knocks your life to one in the face because I despite having two kill spells in my hand and like 5 mana open, they both needed one white which I didn't have (well, had two sources tapped because angels will do that.) So yeah, got knocked out there.
Merfolk on the other hand... well, I didn't win, but I got the dominant position with a field of them working in sync and it was amazing... and then my one friend managed to throw kill at my face twice in one turn and I could only counter one... BUT my other friend had that one demon or whatever on the board that makes it so you can't win and your opponents can't lose. And man, despite both the other two being on the verge of death, I managed to prevent them from killing each other fully for like 2 turns, because either getting lethal would've ended it, and then managed to get them both down to zero for a three way tie. So that was a fun, dumb game.