What separates a threat from a nuisance? The presence of danger versus the presence of a problem. When Robocop walked into Kane's drug factory in Robocop 2, he wasn't scared. Small arms cannot penetrate Robocop's armor. When Tony Stark went toe to toe with the "Ten Rings" in his first generation red suit, he didn't stand down as a tank blasted shells at him. Ironman ripped that tank to shreds. What separates Ironman and Robocop from you or I? Their cases!.
While the Robocop and Ironman cases may not exactly be the type of case we're talking about, the principles still apply. Robocop's suit was made to offer extreme damage resistance and strength. Ironman was built for damage resistance, flight and strength. A mid-tower computer case should be made to offer a usable frame onto which you can build your own dream machine. Additionally, this case should keep this dream machine in the appropriate operating temperature ranges, all while keeping us in style and on budget.
The Cooler Master Centurion 5 II proves that you don't need to be a Stark to build a great PC. The Cooler Master Centurion 5 II offers a plethora of features that used to only be found on tier 1 cases. With grace and style, the Centurion offers a bottom mounted PSU, a CPU cooler access hole, an included SSD adapter that fits two SSDs, support for three 140mm fans + 1 120mm fan, and a completely rail based screwless drive mounting system. With these specifications, the Centurion looks like a top notch mid tower value.