Are we as players afraid of a challenge?

[Jetstream_Fox]

A open world zelda esque sneaking puzzle could be interesting and give an enemy stronghold life. Set enemy spawns along a predetermined path, able to avoid detection simply through patience and timing. Being detected resetting your progress completely/partially probably via death. For parties just pushing through the objective could be to zerg certain enemies before they can raise the alarm and flood the area with reinforcements.

So you basically want MGS 5.