9. The CoolerMaster CM Media 260's Cramped Space

The height of this case alone makes it obvious that the CM Media isn't going to be so easy to outfit with hardware components. While it's true that you can fit an ATX motherboard into this case, the same is not true for all expansion cards.

To use up to three of your motherboard's six or seven expansion slots, you must install a special riser card that effectively rotates those slots by 90 degrees (which means expansion cards lay face down, parallel to the motherboard). Interestingly, CoolerMaster offers both AGP and PCI-Express riser cards for the CM Media 260, which lets it accommodate older AGP motherboards as well as newer PCI-Express models.