Let's get one thing straight, we all have personal opinions about this so I think it's hard to define what really makes good BE art?
For me it's something that doesn't make my eyes hurt 'kay? I mean, horrible "art" is bad BE for me. I guess I'm just used to browsing awesome artists otherwise and stuff and therefor am used to see mistakes and bad things in the drawings themselves.
So, as long as the art ain't horrible and atleast have some depth I'm okay with it.
Edit*
Why did this post turn out n00b-ish? Sigh.......