Dungeons are decent... except for the part where they're unable to be solo'd. This may come as a surprise but there are a shit load of players who do not want to play with others. Period.
Now before anybody has a meltdown at me, I think group content is good for the game and group content absolutely without question should reward all those involved more than solo content...HOWEVER... why can't we implement some way that solo players can do some of these dungeons alone? There's a multitude of ways to implement it to be done, but basically have dungeons have a soloable version and a group version. Maybe have the group versions spawn less but they stick around longer, and their rewards are far superior to the soloable versions that pop up to make them worth the effort.
When so many of your players are hermits who want to do their own thing, you should ensure that they can take part in some of these fun things.
Not everything needs to be solo friendly. I'm fine with never bothering with meteorite shit. I just wanna be able to run some Bat/Beaver dungeons on my own, bro.