I've used ECS boards almost exclusively for several years. They're no worse than any other manufacturer, except at marketing their product. ECS does not make overclocking or enthusiast motherboards, but sometimes they overmarket the Black Series boards to the overclocking crowd, most of whom are buying *** overpriced L33T OverClockerz modules that require way too much voltage.
I find that low end ECS boards tend to be pretty crappy, but their mid range boards are o.k for office builds and the like. Better than PC Chips I guess . Anyway, alot of people think they can skimp on the motherboard, but it's the foundation of your PC. If you're building a PC for gaming, and possibly overclocking, always research the board before buying it.