Most case reviewers simply run a system ans say "Oh wat a great case we have here!" The reality is many very good cases need fans repositioned or new fans installed to optimize / tune the case airflow to component put in it.
The do a case review like getting a nice new 7.1 sound system, set the speakers around the room, plug it is and start watching movies without balancing the sound and volume .. and instead of admitting it's pretty bad calm it's the best sounding system there is. I don't know about you, but when I setup a new sound system it takes quite abit of adjusting to get base & treble, front to middle & back speakers volume, etc. all set right before system performs like it should and sounds good.
Building a new system / testing cases is not different. To get a case to work properly it need fans moved and/or added, rpm curves set, etc. to get it to flow air properly.