It definitely wasn't a "good episode" It was definitely "Titanic" meets "Poseidon adventure"! The sizist jokes were unfunny but intentionally so, the Doctor made it clear that it was so. I would have been happier if Mr Moneybags HAD bought it but then he would just sit back and let everyone else do the "heroic" stuff.
The heavenly hosts did provide some unintentional humour. I also found the "ships engines" funny too - straight out of the Galaxy Quest concept of a spaceship - being powered by big twirly thing in the middle.
As for Astrid's heroics - why didn't the silly woman jump off at the last minute? All too Mary Sue and soppy too.