Thank you for creating this thread, I think it is very constructive in its approach.
I don't remember account names, but here are a few things I usually look for:
Builds that don't have too many floors, since there is no gameplay for it, and the sims take a lot of time wandering the stairs. Lifting the camera takes time as well.
Floor plans that are compact, thought through in regards to routing, and that takes actual gameplay into account. I like playing the game, but not to wait for my sims to go around the bend :)
Beauty, which is very subjective. To me it often means generous colour use combined with colour coding, and using complex shapes (that still are see through whith walls half down), and to think as a builder who builds for a game with its own mechanics, and not a real house architect.