It was hard for me to bump the score up to a 2. There was some definite effort to create a maze of a city and a mansion. I love the conversations and the briefing, which was done in conversation style. The ambient music was also well placed and added a bit to the atmosphere. Things started to look a tad better once you found the mansion, but not by enough margin to make it fun. Sadly, just adding the cylinder ceiling and a few arches made it considerably better looking than outside. But that concludes the positive things I can say about the mission.

Almost all doors and window textures in the city are misaligned (some of them drastically so).
Very bland, wall-to-wall blocks with no detail other than the misaligned textures.
Torches and windows are often placed comedically high up the wall.
The graphics used in the video were so pixelated that I couldn't make most of them out.
Objects are not properly floored.
Guards are often standing in dark shadows, facing the wall to easily KO.
I knocked out a servant who fell to the ground out cold and then got up and ran off until he found a room full of guards, then fell back on the floor.
It was actually jarring when I got to a decorated room after 30 minutes of 30-foot empty stone walls.
Problem with the water brush (both placement and audio)
Backwards scrolls on the walls.
scrolls that go into inventory that don't "read"
Some unkind author moments like a red spider on an all-grate floor and a crayman facing the small and only entrance of a brightly lit room.

Unless you want to play through the entire history of Thief, like a few of us have been doing, I would avoid this. I can definitely appreciate the heart and ambition of the author, but it didn't translate into a fun mission. I actually quit it twice to uninstall, but my drive to finish them all forced me back in to complete it.