It's not you. It's a stretch to think this is the whole deal.
For one, it's not even an entire cabinet.
Second, that thing is pretty ugly. He's got this half-way decent looking CP (not a design I would choose however) plopped right into this ugly brown unfinished box. The box doesn't even look complete nor does it appear to be squared off. It looks like he used that flimsy paper-like pressed lumber and put it together using penny nails.
Third, is that supposed to be the marquee in that one little box? What the ---fudgesicle--- is anyone supposed to do with that? Mount it on their entertainment system above the TV or something?
Lastly, for $600, the seller should at least have the decency to include the

PC. His comment about,
plays on anything better than a pentium 3!
seems to imply that the seller isn't including the PC at all!
I'm sorry, but for $600 I expect quite a bit better workmanship than that.