NetworkManager degrades usability in multiple connection setup

[Jure Sah]

NetworkManager poorly handles multiple connection setups, making it more an annoyance than a tool.

With multiple connection setups, instead of switching connectivity to whichever network is available, NetworkManager seems to collect problems from all sources and blocks networking as soon as any one of the connections has a problem.

My setup contains a wired and a wireless connection, here's what happened:
a) Both wired and wireless work properly: Networking works
b) Wired network is disconnected, but wireless is working fine: Cannot connect anywhere, destination unreachable
c) Wired connection works fine, but wireless is turned off: Cannot connect anywhere, destination unreachable

What I expected to happen:
a) Both wired and wireless work properly: Networking works
b) Wired network is disconnected, but wireless is working fine: Networking works
c) Wired connection works fine, but wireless is turned off: Networking works

I ended up having to remove the wireless adapter from my computer just to avoid everything breaking down twice as often as it usually would.