Good. There are differences in brands, but its mostly personal experience. For example, ASUS and ASRock are sister companies, and offer similar mobos, but a lot of people have had bad experience with the ASRock tech support, and as a result, swear on their lives that they will never buy from ASRock again.
Another related issue is the Foxconn brand. Very good quality, but their recent media attention has caused consumers to look to other manufacturers for their computer components.
The 90 degree angles on the SATA ports are not for cosmetic, they are for the ease of installation. I can't tell you enough how many times i've wished my mobo had that feature.
Things like "OC genie" are overclocking utilities that aid users in configuring their mobos for oc-ing. They essentially make the OC process easier.