As with the first mission, this one has many humorous aspects which I liked very much.
The gameplay is also fine for the most part but what really annoyed me about this mission was the drawn out underwater cave section.
This might be a subjective thing but I can't remember any game where I had fun with underwater sections, Thief is no exception.
It's very easy to get lost and the distance to the next air bubbles is pretty far so taking damage is a strong possibility even with "strafe-swimming". If you went the wrong direction it takes too long to get back on track at least in my opinion.
If you have a good sense of orientation and don't mind long underwater sections, this might still be a fun mission for you.
If you absolutely hate those I would still strongly recommend to watch a playthrough if you enjoyed the humour of the first mission, it's definitely worth it.