As an "IT admin", it's not that I need convincing. It's that the rest of Googles "office" products are absolute amateur hour and support is non-existent.
Not quite sure about this. Gmail (both personal and company accounts) is IMO a great email client with loads of handy features, and I always felt Google Docs/Sheets/Slides/Drawings were well put together. Are they the best in class? I guess it depends what you are looking for. Could Drive be faster? Yes, that would be nice. But "amateur hour" sounds like we are simply using different products.
HN: https://news.ycombinator.com/item?id=30227588
Article: https://medium.com/@laurajavier/google-slides-is-actually-hi...
Regarding support, that is not an issue I have never needed it for Google, but occasionally have needed for MS Office. So I can see why if you are using Office you would value that.