I just watched it. It's quite interesting in some ways, I like its ambiguity, its visuals, the boy actors, specially the one that plays Vanya is very good. But...
* possible spoiler ! * ...I don't know, maybe I just saw it in a bad day, but it didn't convince me completely, the boy afraid of the tower in the beginning/ going up the tower in the end I found a bit obvious, besides that photograph disappearing thing, I usually don't like films that end in a "symbolic" note that suggests that it should be seen as a metaphor rather than at face value - well, at least in this case it felt a bit "artificial" for me. However, it is true that it has some nice poetic touches, wonderful nature, and the concept of the loving/hateful father was very interesting (I hadn't thought of it as a metaphor for Russia, as some people suggest in their comments, but it makes sense). But I don't think this is anywhere near (the best of) Bergman or Tarkovsky.
* possible spoiler ! * ...I don't know, maybe I just saw it in a bad day, but it didn't convince me completely, the boy afraid of the tower in the beginning/ going up the tower in the end I found a bit obvious, besides that photograph disappearing thing, I usually don't like films that end in a "symbolic" note that suggests that it should be seen as a metaphor rather than at face value - well, at least in this case it felt a bit "artificial" for me. However, it is true that it has some nice poetic touches, wonderful nature, and the concept of the loving/hateful father was very interesting (I hadn't thought of it as a metaphor for Russia, as some people suggest in their comments, but it makes sense). But I don't think this is anywhere near (the best of) Bergman or Tarkovsky.