Most of the time, people post negative reviews. To me, it is the big picture. Also, casino guests do not really get anything special with regard to housekeeping services. Same rooms/suites and same housekeepers, daily cleaning and turn-down.

Now, regarding Vegas, not an excuse but a reality:
"True luxury" is next to impossible to deliver in Vegas. I find that Wynn/Encore Tower Suites, Crockfords, and Four Seasons Las Vegas do a decent job. But still, Vegas is Vegas. You also have other niche products like SkyLofts and Aria Sky Suites that consistently deliver.

Setting aside the "true luxury," Vegas hotels are too large to deliver consistently. There is no excuse for bad housekeeping, of course. But, it happens and happens more often in Vegas. But, the other questions become:
How was the bell service, in-room dining, check-in/out experience, turn-down service, spa, pool, breakfast (Tableau, Jardin, Terrace Point), etc.?

Also, you mention: "more of the travel agent's fault for misleading everyone in their confirmations," -- and while I know you were hoping for a miracle at check-in, this will not happen in a 100% full Vegas situation. I would be more curious what service recovery the travel agent provided. Did you contact the travel agent and have them adjust the rooms? They give you a discount for misleading you? Did they send additional amenities? To me, this is the much bigger issue and started your trip off on a horrible note. In my experience, when clients/customers/visitors start off their trip badly -- they tend to view almost everything else in a very negative light. I get it; that is human nature.