I agree, and the EP4000 is marketed for PA systems, so it's probably not the best choice for your home stereo, as PA systems generally want volume over quality. Although Mackie is generally regarded as the top of the line in mixers, so "even a Mackie is better" doesn't make a whole lot of sense to me.
I checked the specs for the amp and it's 550W RMS into 8 Ohms @ 1% THD, both channels driven. Not too shabby, especially for under $400.
But again, I would never get a PA amplifier for my home stereo unless I didn't care at all about sound quality.