Our current project uses what I feel like are pretty standard features for a SaaS app. They include C#/.NET Core, Linux App Services, SQL Server, FrontDoor, SignalR, Functions, etc. Functions is the only feature that has been bumpy for us deployment-wise.
The journey of the various portals has been fun. The current one isn't perfect but it's far better than my experience using AWS. It's got to be a challenge to organize such a massive portal developed by so many teams.
The effort MS has put into documentation has been really great as well.
That said, there's a lot that could be better. A lot of the PMs are on Twitter I tend to be a squeaky wheel there about various problems so hopefully they're listening.