I keep seeing that stupid Mall map all the time and I leave the server whenever it comes up. I would like to emphasize that (In my opinion) it is not only not a good map, but a HORRIBLE one!
The design itself makes kiting so easy that if you know what you're doing, it's impossible to get cornered. There are so many alternate exits, side hallways, and various routes that it's near impossible to get caught. Factor in the already huge size and the openness...you get a ridiculously easy map. You can even jump down from the upstairs if you get surrounded, to kite again on the ground floor.
Half to doors don't let you through, even when opened. Same with the windows. And almost all of the shops are the EXACT SAME inside, save for a few minor details. Also, the 'High Times' store filled with bongs just screams pothead adolescent mapmaker and kills any feeling of a professional map that this one had going for it...
I played Origins more and I like it, but it's just plain too cramped to be fully playable. There's almost no room to move around...about 2/3 of the map is made up of single-wide passageways...the only areas that have any real room to move around (The basement areas) are dead-ends with no ways out. So it's either get stuck in a series of narrow hallways or get stuck in a few dead-end rooms. Almost impossible to survive once Fleshpounds start turning up.
Played Heresy-Beta as well. It's a conversion...not a bad map, but too big, like many others, and until you know where the trader is, it's hard to find her. It really does feel more like an Unreal Tournament map than a Killing Floor map, though, even with the environmental changes...