I just watched this as it has debuted on Netflix.
Honestly, if you don't like Will Ferrell films at all you won't like this.
The movie is definitely too long, clocking in at just shy of 2 hours, also a lot of the humour is very obvious (I realise people will say that's Ferrell but he can do wit and clever dialog).
However, I would still say give it watch. Dan Stevens is brilliant as the Russian performer and I liked the music and musical numbers and it still has a few chuckles to be had throughout. 6/10.