Airflow in my opinion isnt bad, the side of my case is bent, so I actually cant even put the side of my case on, so is that bad? I would think that would only help the air flow..
I just noticed after playing a game for a while my temps got to 74c, that seems hot.
don't worry about the side being bent; i haven't had the sides of any of my cases on for over 13 years w/o a problem.
74, is that you cpu? a gpu can get up to 90c depending on the card. but most importantly, what is the temp in the room? if it is hot like 28c than that idle won't go much lower as is.