The Rating are misleading it's one of the best movies i have watched CGI wise it was good and story line was good as well , so now the question why it has low rating if it's that great? Right let me tell you something.
There are primarily two reasons why it has such a low rating even though it not that bad, it's not a master piece but it's underated fr.
1. It's russian not hollywood , so people get sceptical about a non hollywood movie being good basically biased ,ok.
2. There are no popular hollywood actors , because i know some shit moveis which have good rating just because of the actors.
So , is it worth your time ,yes belive me it's worth it if you love sci-fi and extraterrestrial stuff you won't be disappointed.