/vr/ - Retro Games

I started looking through level credits on the wiki and was surprised by how many Sandy had a hand in, and it lead me to look up more of Doom's map authors and ponder a few things about the general opinions people have on them. So here's some questions that I'd appreciate feedback on:

In terms of overall map quality, how would you rank the map makers of Doom 1/2? (ie Romero, Hall, McGee, Sandy; Green can be ignored due to only making three maps.)
Since people often criticize Sandy for making some of the worst maps in the games; do you think of him as a bad map maker overall, or do you think of him as a good or average map maker that just happened to have made some pretty bad maps?
Considering the number of maps Sandy's made for Doom 1/2, what ratio of his maps do you consider to be good/average/bad? (ie "mostly average, some good, some bad", or more specific)
Do you think Doom 1/2's map quality could have been improved if Romero had worked on more maps for both games?
And what are a few levels that you consider to be the best and worst of Doom 1/2? Do you think these maps are inherently good or bad because of the person who made the maps?

Thanks in advance to those that answer, because I'm genuinely interested to see what people think.