Alot of people in this game can't get the idea that the best thing for them to do, sometimes, is nothing. Or certainly is not to attack, but wait passively for someone else to do their job.
1. rogues - often this means everyone else should wait while they disarm the trap.
2. fighters - the caster waits for them to kill the mob
3. mages - everyone else just shield blocks of surrounds the mob so that the mage can safely kill it.
D&D is based on the idea that everyone has a role. In PnP, when the wizard casts levitate to get a better view of whats around, everyone else doesn't zerg forward to go kill things. Sometimes, oftentimes, D&D is about waiting around while one person does something and everyone else shoots the breeze.
Unfortunately, because there is the "traditional" idea of 4 fighter types (including rogues) and 1 cleric and 1 arcane, the 4 fighters believe (through the tyranny of the majority) that every problem can be solved with a swing of a greataxe. They can, and hence, the complaints of widely varying difficulty.
Personally, I never thought freshen the air was a difficult quest. I've never had any problems with it, I always thought it was sickeningly easy (compared to how "hard" it was supposed to be). However, I'm not zerging through there getting ripped to shreds by magic missles. I'm slowly ranging all the casters outside of MM range.