They're nicer than the cockpits. So yes, on a 3 hour sit at our domicle - I'd much rather leave the plane, go into the crew lounge and sit down.
But are they the Crown Rooms or other airline respective "member" lounges? No, not even close.
We get free coffee (not the best, but it is free), and free popcorn, just someone has to actually make the popcorn in the little movie theatre'esque popcorn maker - which I haven't figured out yet and most likely never will.
When have a lack of productivity sit at an outstation, we usually just head down to the operations breakroom and sit there or up in the terminal.