Once Google Cloud manages to hit the numbers, you would expect things to be much better for the smaller players (this remains to be seen).
Not excusing their support operations, but I did manage to get on chat with someone about a Billing issue (to understand my billing better), and I was pleasantly surprised at the response time (immediate).
The slow and free support route is to use the Google Cloud issue tracker: https://cloud.google.com/support/docs/issue-trackers You tend to use this if you are not critically impacted and you are also a developer.
By and large, things works as advertised. You can keep spamming that Feedback form in the Cloud Console. Product Managers do read it and address it.