Underpass is a sweet map, I don´t know why people don´t like it. It has many routes to each side, vertical action, windows, close quarter and distance combat and an unique visual with the rain.
IMO the shit maps are Wasteland, Derail and Estate, that are basically camp or die and no variation of combat style. The new ones on the stimulus package seems pretty sweet.
And Notuern, I hear you about the hacks. I´m also playing on computer and it´s growing each day. Not much the hacked servers, but it´s incredible common to see dipshits using level hacks, wallhacks and aimbots. The shittiest thing is that without dedicated servers, most the time I leave a match because there´s a fag cheater and try to enter on another, it ends up on the exactly same I have left. It should be so easy to ban the motherfuckers and close their Steam account with all their games, but both Valve and Infinity Ward are giving a shit about their costumers.
Just removing the option of changing the nick on Steam would help.