The idea of Zeds running indoors isn't very appealing, they already sprint like a champ and zig-zag like a pro NFL player. Perhaps if there were more Zombies it would address the no teamwork/low-threat-Zeds quo. I'm all for making it frighting and hard, hey I might even be wrong not having been able to go against Fast indoor zombies yet, but roll the following around for a minute: You run inside from a pack of 5 zombies, they sprint in after you and usually end up going to far when you stop to shoot so they get behind you, you get surrounded and mauled. Death/K.O. in seconds. Sounds scary/fun sure, like a rollercoaster, fast and intense. But you died, fast(yeah yeah you should never have been caught, but shit happens, maybe a bandit fired off a round but the zombies found you because you were close and just unlucky). Its over before you know it. If you had a satisfying run no big, start over. Although if this happens often its gets frustrating. Not bad I think, but because you cant just dive out of windows due to it being a game with limits that you have to limit the realism unfortunately. The "If this were real it wouldn't have happened like that and I would have survived" factor. It's the ping response factor, they ran too far, through you usually and just turn around, sweep the knee and break your femur. Very Arcade-esque. Less forgiving, borders "Nintendo Hard". Now ponder this: They same city is packed with triple the amount of the undead(performance aside) that are slower, you run inside and they just pile in. Your gunning them down, maybe with friends but they don't stop. This isn't COD so you don't have hundreds of rounds of ammo(usually) so every miss makes your stomach lurch. The horde just keeps rolling in andif you are alone you can't fight for very long so you need friends(high zed numbers would also make it dangerous for bandits to go on player killing sprees). It could very well be your last stand and you must make the shots count to make an exit. Its that uneasy feeling of being trapped that is in between raw fear/shock and tension just on the border of instinct and rational thought. You have to think your way out, you cant just dive out a window. Plus the zombies don't flank you due to ping response speed. With slightly slower zeds they would attack you as soon as they got to you and not accidentally run by, unless you cut and dodged and it was on purpose as opposed to you stopping and turning. But hey, both of this could be completely luck based/situational and turn out to be too cinematic. Who knows, the Mod is only in... uh... it's first trimester? Not quite infancy even ha.