I have mixed feeling about this. On the one hand, I like historical dramas, especially when they seem like they are somewhat accurate. Also I found the first season to be interesting, as I didn't know too much about Godunov. On the other hand, the second season was REALLY dark. The long descent into madness started to wear me out after a while. The "Russian Soul" can get a little intense if you're just looking for some light entertainment. As far as the filming, sets, etc.. I'd say it's OK for TV. Same for the acting, not exactly top level performances but not bad either. My final opinion, it's worth watching both seasons, just think about taking a few breaks along the way to recover emotionally.
Review of Godunov
