It starts off really well, but there's a lot of filler, and the ending was somewhat disappointing. The way they resolved it and unmasked the villainous killer... ugh.
It also happens to me when I see an actor with more wrinkles than before; at that moment, I look in the mirror and see that I have more gray hair. That's life, haha.
It would have been better with six episodes, I agree. I hate unnecessary filler in series.
I finished the final episode yesterday and I feel the same way as you about the very predictable ending. There's also a lot of forensic mishaps and unexplained aspects of police-work that annoyed me. When Aggie gets accused of murdering that kid nobody seems to be at all concerned about the fact that she is 110 lbs at best and it wouldn't be physically possible for her to do that. That part of the plot really wasn't developed enough and it seems like they just kind of threw it out there as some sort of twist that just didn't pay out.
The convenient running out of phone battery during crucial moments is a plot device that annoys me no matter when it appears in films or series.
The sudden turn towards being virtuous on the part of the Jarvis father doesn't make any sense either. They completely changed his character's persona because they needed to wrap things up I guess.
After the first couple of episodes I had really high hopes for this one but they really screwed it up halfway through. pity!