Good start, but... The first 3 episodes were interesting, if you're into demons, possession, and satanic conspiracies. Subsequent episodes became increasingly annoying, especially the Mayor, Paco. The season finale, which co-starred swarms of flies, did none of the characters any favors.
By the way, I watched every episode yesterday, and Paul Giamatti isn't in a single one, despite being billed as having been in 8 episodes. He may be in season 2, which has yet to air, but using Giamatti to promote season 1 is misleading. If he is in season 2, it's a part he probably should have walked away from. He's too good for the material.
I would recommend taking a pass on this one. The fact that it airs with subtitles is the least of its problems.