I largely agree with this. The best ones are still in the Apple-made apps, since they clearly had a lot longer to think about how best to implement the functionality.
What’s interesting is that, from the way I understand it, apps will be able to allow users to set the 3D Touch quick actions themselves. That is, you can “pin” ones that you want to always be there (limited to four actions, of course). The folks who nail an easy, intuitive way for users to set their own will be big winners here.
Based solely on the apps I’m beta testing, I bet we’re going to see a lot of great updates in this regard in the coming months.