Well , surprisingly , I think I've done a pretty good job with BOG:S
If you don't want to have the intro spoiled , skip this.
I tried to give a reason for the player to get a weapon. Unlike most maps where they are just laying around , this has a point.
In the map , you are faded in to a view camera looking on a small alleyway with a forcefield covering it , protecting some fragile crates and the conditioning for a combine factory. A metrocop sees a fault with the barrier and walks through, and has a go at the control panel. A citizen decides he can gossip to his friends and leans next to the forcefield emitter. The idiot metrocop buggers it up and gets himself killed - Overheating the forcefield blowing it up , and igniting the poor citizen , giving the player access to the crowbar the metrocop was using. The fragile box is highlighted to show the player something important is in there - and that's an HEV suit. As soon as you break the box, a nearby citizen yells at you ( Thanks to MegaJohnny he has custom voices) , trying to grab your attention. He wants help but tells you you can get there by busting into a door. This door has 4 highlighted locks.
The rest is unfinished.
If you want to test this map so far , Please go into the map vault and download it.