Are you a site admin or something? Anyway...
That site is completely different from this one. This site aims to preserve original game art as well as offer a classy method with which to organize and store our beloved titles. VGBoxArt is a site for fantasy art covers that have no real use other than entertainment.
I'm not saying VGBoxArt is bad or anything...just saying it's kind of unfair to compare the two when they are entirely different things. Aside from that, if you want my personal opinion of the site, I wish VGBoxArt's covers were uploaded to standard resolutions and sizes for each console in printable format. While the vast majority of the stuff up there isn't very good (no offense to the artists), there are several gems in there that I'd love to actually use on my actual games...but I can't. In terms of just looking at covers, I prefer browsing this site a lot more because not only do I know that if I find something cool I can always actually use it, but also because this site has a majority of quality work. A lot of the work on VGBoxArt is just cut-and-pasted art that breaks the style of the games whose titles are plastered on with incorrect font. On this site, each cover moves to preserve the original game, since the covers are destined to provide a housing for the game. On VGBoxArt, any child that can type "super smash bros mewthree" in Microsoft Paint can post a cover. (Believe me, I've seen a good share of MSPaint abominations on that site.)
In the end, it doesn't really matter. You can't use any of the covers on VGBoxArt, so everything is purely for fun. When I criticize VGBoxArt, it's in the context of actually using the covers. In the context of doing nothing with them and posting them for fun...I really don't care. Most of VGBoxArt is of minimal quality.