I suspect most "mappers" prefer comments plus a up rating, as we often put upwards of a 100 plus hours into making each map in Hammer. I currently make scenario mods for Master Of Orion, but nobody rates anything there. At least in Portal, the community understands how much we appreciate the comments and up ratings for all our hard work.
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The crazy thing with map evaluations is it varies widely depending on the player's personal tastes, design preferences, and pet-peeves. One of my highest rated maps was dirt simple and beautiful (or lush), but I always get a lot of complaints when they're too simple; yet, when I make "tough maps," I then get lower ratings and complaints they're too hard. Because of that, I went for making hard and easy versions of each map in an effort to meet the desires of both camps. I don't current map anymore, but was a hoot and fun when I did.

@◢ Vik ◣ - What you propose would be great, and I think it's a good start. Then the players that have difficulty describing their feelings about a map wouldn't have to struggle with all the words. Your list pretty much hits all the major points of map/puzzle mechanics.

Unfortunately, Steam would have to redesign their database for keeping track of each map's statistics and more than likely make it a lot bigger than it already is. With over 775,000 single player maps, that would be an awful lot of effort, time and work (all of which together = $$$$).

So I don't think it's likely to ever happen.

@Chippoka - I've noticed pretty much the same thing you have. Easy maps get the most votes and complaints of being too easy, and the Tough maps get the fewest votes with complaints they're too hard.

The really difficult thing for a map/puzzle maker is finding that sweet spot right in the middle.

Those are the 0.001% at the very top of the most popular list for all time.

I keep dreaming of hitting that sweet spot...