I don't think the McFarlane Robo is so visibly, noticeably low-end. In fact I think its really cool except for the innaccuracies. I'm not sure how your wife, presumably not a toy collector, saw it as being of lower quality.
She said the lines are not very clean and there are lots of lines on the legs (where the rubber did not fill the mold completely). I thought it is very accurate sculpt wise