I've heard the same on DC Heroes. Wiki only lists a handful of adventures,
a brief look at info on them varies, the third one is 1-on-1 where you play
a specific character, the first one either or of playing established or your
own (how well that works with your own would require more investigation)
and the 2nd is for your own heroes.
What little I can see of mechanics turns me off, in that it says powers and
skills are rolled against somehow on 2d10, and doubles rerolled (why? and
I hate rerolls in table top games.)
It says DC heroes got reworked without the DC connection into 'Blood of
Heroes' which was bought up and left for naught. I hadn't even heard of
that one.
Marvel has a ton of adventures apparently free at least if you want to play
the marvel heroes, I'm sure a lot of people I've played D&D with would love
that, but I find the lack of creativity puts me off. The system plays pretty
well though. I probably should've just taken some champions modules
and modified them, or seen how much trouble it would be to modify
the Marvel ones. I just wasn't very confident with the system.
I remember listening to a podcast review of the unfortunately named
SuperBabes Femforce RPG that actually sounded really good. I'd be
tempted to try that sometime if I could actually get players. The
podcast info is here
https://saveforhalf.com/2017/12/
I don't know much about Icons, but I remember that was one of the
more well reviewed systems when I was looking last time. Good luck with
that, let me know how it goes!
- Justisaur