Re: What do people want in a scene/mission?
1:
Challenge:Vanilla missions are not hard. It makes it more tedious than fun to murder zombies or dummies over and over again through easy choke points. Missions should be difficult, but beatable. Make the player multitask and/or resource starve them to force them to make smart choices with their money.
2:
Innovative/Creative design and Detailed Objectives:I can only play so many "defend your brain until help arrives missions". Give the player complex objectives that take either time or luck to overcome. Examples include finding parts to a key to get past a gate/door, digging for a secret entrance to X facility, etc.
Another good mechanic I see rarely used is a timed objective. Kill/rescue X actor within X time frame or you lose. A fun example might be a map where a deadly gas cloud is raising in level from the soil and you must fight your way to the top of a tower for evac before the poison rises and kills you.
3:
Lua scripting:It's really become a priority and essential part of a good mission. It also makes things a lot easier and helps bring ideas to the table. Not to mention it vastly expands the possibilities of what a mission can entail.
4:
More weegee: In before it.