Just charged my phone with my laptops Usb-C charger, without any issue. Apart from special features like fast-charge, I'd say compatibility is very good.
I used to work at a company whose products included USB-C ports that only supported cable insertion in a single orientation--if the cable was inserted incorrectly, it would fry the board. Manufacturers have a lot of freedom to cut corners with this standard in all different places, and you better believe that they are going to do that to the greatest possible extent.
Warranty laws in the EU (2 years mandatory) make this less of a problem - eventually a manufacturer must realize they'll make more money doing things right than replacing tons of fried returns.
This particular company simply made USB-C cables with massive overmolded pokeyokes that ensured they could only be inserted in the proper orientation--which works great until some poor bastard comes along and tries to assemble the thing with the cable he brought from home. Oh well, not my problem anymore.