System is pretty solid as is, there's enough wiggle room to skip stuff that looks awful (perfect hunts and long survivals) and still get the rewards, but that's probably not obvious to a lot of people and they feel twitchy about skipping stuff because they don't want to miss that shiny forma. If there was some good clear way to show that you've gotten X standing out of Y possible for the week and the series AND show how much is still possible in following weeks so you can tell that you're still on target it might help. Challenge variety is great though - I'd skipped Lua puzzles forever and that was fun. I skipped the 60m survival but thought it was a good idea even if it was probably too long. Doing stuff with friends/clan had gotten me to meet some new folks.
I get how the system isn't totally friendly for newer players who don't have access to a bunch of stuff, so maybe there can be an alternative method/weekly alerts for getting build necessities like nitain that are available to everyone. Or just make it a planet drop.
Also agreed on wolf spawning, it'd be cool if frequency was tied to captures. As it stands I still haven't seen him and probably never will.