The Journey To The Centre Of The Tardis had some nice moments but no story.
When they tried this sort of thing in Tom Bakers era it was less visually lush but at least it came at the end of a story with twists and turns and interesting characters.
It was highly derivative of Sunshine too.
It's a shame because at times it looked like it was actually going somewhere interesting with certain things returning.
It was also a pity they didn't throw in some bits of architecture from past iterations of the interior (the 'boot cupboard' would have been nice).