I like the new challenges 
The only challenges I didn’t like 
(that I had) were “play ranked odd ball” and “play strongholds”.
What’s so challenging about playing a game mode that doesn’t have its own playlist? I’m fine with challenges that say “play ranked, play fiesta, or play team slayer”. At least I can play those modes by choice and be challenged!
I can imagine people quitting more games in the beginning because they’re get game modes that don’t meet their challenge requirements 