I really enjoyed the first episode, and some parts of subsequent episodes, but yes, it is definitely a "slow burn" show. I also don't like the subtitles - they don't leave them up long enough (and I'm a fast reader) and the font is too small.
Pros: the mechanical "dogs" are different. They're not rays or lasers or energy beams or big ships that float around blasting stuff. It's a different approach, they are evidently the aliens' eyes, ears and arms/hands. At least it seems that way for this season. The blind girl can, for some reason, see now. We don't yet know how/why that happened, but she can also seem to exert some kind of influence on the "dogs". Nice little mystery behind those two elements. Not a ton of language in it, just a pet-peeve of mine in sci-fi shows. Some good action pieces, but still a "slow burn".
Cons: They are paying-out the plot very slowly (hence the "slow burn"). Only a few likeable characters. Why did all the interesting characters get killed-off in the first episode (bad joke on my part, okay, okay...). With all the dead bodies laying around, one would think the stench would be getting rather intolerable outside by now...and wild animals would be feeding - haven't seen anything but a minor indication (the two guys hiding in the car from the "dog" as it was hunting for anyone alive) that anything outside smells bad. Why the "dogs" piled a lot of the bodies in a warehouse was left unexplained. Moving the radio-telescope dishes caused an alien to crash? Long after the invasion was over? Why? How? Well dang, start swinging them dishes around in big circles then!!! Broadcast death-metal over the dishes on all frequencies, maybe that'll take care of the aliens?
I could go on, but I've hung with it for 7 episodes, so I'll see how they cliff-hang us tonight to get us to tune in next season, which probably will be at least a year away, if it even got the nod for a second season...