The 'Ministry of Joy' theme comprises a boring sign that nobody reads and some text on some screens, it's barely a theme really. The most entertaining parts of the ride's theme is its wildness and the industrial vibe, it fits the disorientating ride really well and the black steel everywhere.
Unfortunately it just isn't enough, the rest the area is so bad and really detracts from what's otherwise a fun coaster. The Marmaliser is a great idea, but you can see how many budget cuts it had to go from the intention to reality, in the end it just gets lost in the ride track and looks so cheap. The screen is pretty good though.
I also agree that the ha ha ha thing and all the screaming is overkill, but otherwise it's a really good soundtrack that suits the ride perfectly!