Let me just get my time machine out of the shed … 
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Perhaps an editor view that would ask what you were driving/riding before adding the value would be better in that case?
Basically first question.
Were you driving a car/4WD/skateboard/bicyle etc ?
And then you give your opinion of the surface based on your experience as good/okay/bad.
The editor then assigns the correct value depending on your ride.
So for examples:
if skateboard and good then value could be excellent
if bicycle and good then value could be good
if car and good then value could be intermediate
this might help to break the bad influence from the meaning of the words?
With gaps this large, if they were also deeper, I would probably have voted for smoothness=bad as it would be inadequate (mostly unusable) for city bikes. If the gaps were deep but narrow, then it would still be smoothness=intermediate because the top of the blocks is quite flat and evenly aligned. If the gaps were narrow or shallow but the blocks where not flat or were misaligned, I would tend to vote for smoothness=bad for the same reason.
For a moment, I was unsure if this would fall into the smoothness=very_bad category, as a car with high clearance might be necessary, not because of the smoothness/unevenness of the surface along the tire tracks, but because the central part is slightly elevated with some slightly taller rocks on it. This is an aspect that perhaps needs clarification on the wiki.
To me it looks like the best three values (excellent, good and intermediate) are bike-centric (they make very little difference for car routing choices) and the rest is car-centric (they make very little difference for bicycle routing choices).
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