I have a global subscription. I don't expect connectivity between the Philippines and Japan, Greenland and St. Johns/Maine, Hawaii and Pacific atolls, and other bits of unpopulated vast oceans. I'm also happy if I get connectivity 50% of the time.
In the past year, I have complained twice and received ETCs. But I don't think it's really worth complaining. I want to reserve my complaints for real stuff -- like when I sat on a wet seat! Or there's trash in the front pocket.