The ASRock Z77 Extreme11 is a special motherboard. The presence of an 8-port LSI SAS/SATA RAID controller is unique, we have not seen it on any other Z77 boards. Add to that the dual Intel Gigabit LAN, lots of USB 3.0 ports and a good WLAN implementation, and you have a board no other manufacturer can compete with. The question then is how large is the intended target group. If you have workstation-like needs, you're more likely to opt for a Socket 2011 motherboard that has more PCI-Express lanes, is compatible with faster 6-core processors, and has more memory slots. In a way, ASRock made a great motherboard, but with the wrong platform, Socket 1155 instead of Socket 2011.
One point of criticism is the high energy consumption, but it's understandable considering the many extra features such as the WLAN adapter and LSI RAID chips that eat a lot of power. However, ASRock could have improved the mediocre analogue audio quality.
In the end, this is an interesting board for a specific target group that wants to install that many hard disks and can take advantage of the unique features. However, most typical consumers will be better off with a more affordable Z77 motherboard.