These line of sight issues have been around since alpha. I remember encountering them a lot while playing my sledgehammer build over a year ago.
Example: Gangster throws a net, then runs a few squares away. I'm entangled and can't move. I can't shoot her (or aim a grenade properly, etc.) without moving half a grid square, yet she can still shoot me. The entanglement wears off, and then she throws another net. I'm entangled again, and there's nothing I can do but wait for her to run out of nets or die and reload.