Oh my goodness. Have you seen the new Google Classroom rubrics? You may have noticed it magically appeared in your Google Classroom recently. Curious about how to use them? Well I have created some videos that will hopefully help.
Creating a Rubric inside Google Classroom.
Using the rubric in Google Classroom
I use more of a checklist style rubric. So I created one using the same method.
You can also import from a Google Sheet. Alice Keeler has created a template to help you create one.
Hopefully this helps. Try out the new rubric system in Google Classroom. It’s pretty amazing.
Infinitely Teaching 
Thanks so much for sharing this! This looks easier to use than the Doctopus/Goobric combo, so I will definitely try this out next time I have an assignment on GC. I appreciate the tutorials!