Just as others mentioned: cheap construction, thin walls and floors equal a noisy hotel where you can hear every footstep above and every door slam.
We stayed in C bld, closest to the exit leading to the casino. There's a massive electric pump motor winding up, then grinding to a halt with a thud all night. Seriously, it sounds like a truck backing into the building every few minutes.
The front desk was professional and pleasantly dismissive. Apparently they're used to it.
Just don't do it.