Yes, although some apps don't have trouble with them - easy enough to fix though, just cut the N-gon.  Considering how slick and perfect that model is otherwise, I doubt it was an accident, probably the person just had no reason to avoid N-gons. 

I think that's supposed to represent the bony bit on the outside of the wrist

oh right :)  Thought he meant the one on the outside

Oh sure enough, I didn't notice that one :)  Dirty little N-gons!

pjz what do you think?

Lookin good, very clean :)  I think if you plan to have geometry that will handle the detail of tendons on the back of the hand, you need to go ahead and cut it into the base, but that's your choice.  I still think the tops and bottoms of the fingers are a bit more flattened than I'd have done it but good work nevertheless.

i agree the fingers are to flat. i will fix this today.

feedback

I like that a lot, great job :)

hmm i think the topology around the thumb could be a problem?

In what respect ? (looks good to me but I'm not too great at modelling yet)