This might be because of what
@D3X said, since the way infamy is set up, your total win rate
has to be positive to achieve an infamy rating above zero. After buffering your infamy a little against bots when you start the game, you can start your slow ascent upwards. You're purposely kept from rising too fast, regardless of your actual skill level, for the same reason regular gear progression is so slow. The only way to manipulate the system on your end is to either lose on purpose, so that you lose every match you were predicted to win, or be hyped up on legendaries and/or be too powerful for your infamy level, so that you win every match you were predicted to lose.
They could probably fix this problem by changing the ranking system so that performance makes a greater impact and it isn't a straight 1-to-1 give-and-take win-or-lose.
Personally, I don't even really consider forced 50% to be a problem in terms of just having fun, it's just the other effects it's had on the game. Most notably, the atrocious states of the starts and ends of the game right now. New players fight bots and then roll straight into Mk 4s. Nightmares can't seem to break 5000. There's no progression at either end.
And again, I'm not saying skill doesn't matter. I'm just saying it's not going to get you to Nightmare until you have Nightmare gear, regardless of how good you think you are.
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