I saw it this morning with my frieds and it was a bit...meh.
As a movie it's lacking, but as a fanservice it's really great. Some really bad acting (the king, the queen), some others are good (khadgar, lothar). I found that you need to know about the lore and the games to enjoy it, as there were lots of people asking about things not explained in the movie that we're supossed to know. The CGI is really great, but there are moments that looks like they are WIP (gul'dan at the beginning of the movie, some mountains around the portal). Good OST. People seemed to hate that we are supossed to like orcs. Medivh's story seemed rushed and not well explained. Khadgar is uber cool.
5/10, and I can't recommend it to people that don't know the games and the lore.