It's not bad that a map is box-like, as long as other points are fine...
Better a box-like map wich is playable, than a randomshaped map wich gameplay just sucks...
In this case, it's a combination of bad quality.
When I only look at the screenshot, you can see texturing, geoemtry, detailing, lighting and probabaly even flow, is bad. It's not even right packaged!
That's why I won't give it any higher then 1/10 since it's just not worth to get any higher point.