Unprofessional? The quality and production values in this video exceed the comparable drivel that vlogger channels put out. The sound is nice and clean and mixed well. The transitions are fluid, the footage is a nice balanced mixture and the script is snappy.
To err is human and it's good to acknowledge past controversial choices. No one is perfect, no company is perfect. It's quite common for companies and brands to look back at themselves and poke fun. Heck, look at what the BBC have been doing with Doctor Who marketing material recently.
"Look at how awful these special effects were back in the day!"
"The hair, the costumes, omg we look so silly!"
This behind the scenes content has gelled with a lot of theme park enthusiasts, and seemingly non-enthusiasts too. It's very well put together and entertaining. If there weren't value in it they wouldn't be bothering.
This IS a story. It's the story of Thorpe Park, what it was, where it's been, the suspect choices it's made over the years and where it's going now.
I'm struggling to work out why this series bothers you so much, especially as you're actively engaged in a community that loves this behind the scenes stuff. We all care about how the sausage is made, or we wouldn't be talking about the most minuscule of theme park changes.