I have read M&M probably 10 times, the Michael Glenny English translation (the others are worthless). This series is a great effort to visualise Bulgakov's grand novel. It is immediately apparent that a series of short films is the best format, so good on the funders and producers for getting that right. Most scenes are just how I pictured them, which really says something for Bulgakov's powers of communication.
I really liked the cast. Initially I was very surprised at the 'old' Pilate (Kirill Lavrov - at 80!), but after 5 minutes of being mesmerised, I realised he must be one of Russia's greats (and indeed he is). Although his age is technically unrealistic for a Roman procurator of Judea, it is a masterclass in acting. Woland (Oleg Basilashvili) is a towering presence, just the right combination of menace and pathos. Kovalchuk certainly looks the part as Margarita - and I am not sure that she could have played her much differently: it is a difficult character to understand from the book, one whose actions but not thoughts are externalised.
Great music. Decent enough special effects & animatronics to cover the magic bits (some younger people will complain about them, but you are forgetting that good actors in a real theatre can make you believe anything, and there the sets are just painted wood). Overall the pace feels right. I think its an excellent overall effort.
Any true M&M fans will appreciate this work, and I am sure find it easy to ignore the small flaws.