I use Xamarin regularly, and it's true the primary downside is frequent bugs and regressions along the entire toolchain, and in the Xamarin wrappers of native APIs. That said, it's improved by leaps and bounds in since last Summer. It's gone from "I'm about to dump this platform any day now" to "minor nuisance", and most of the time you can just get on with your work.
For the record, I use Xamarin "classic" and not forms, and my comment was in reference to that. Given the age of X.Forms, what you say sounds par for the course.
