I agree with the lack of shelf (a fold-down shelf behind the door would be ideal!) and storage space, and they could definitely do with a refurb, but I think the slurping noises are just hilarious. I usually end up s......ing by the end of a shower as I think the drain cannot make a more ridiculous noise and then it further excels itself. It reminds me of a comedy sketch of a small child sucking unfeasibly long and loud on a drink while in church or similar.
Possibly parts of my brain still have a mental age of about 10.