It shouldn't sadden you. I look at Dexter the same way I look at Saw and Hostel. There're people out there who can't handle a deeper story with a compelling plot and characters you can actually give a damn about. And these things were made for them.
But...every single character is very well written, and I give very much a damn about them....
Dexter...for a show about a serial killer is hardly violent. They never show him doing what he does. They either have a cut away, or a reaction shot. They never show you the detail. You only got to 4 episodes. You honestly cant say you know who Dexter is. He starts off as A, and ends as B. He's incredibly different in the last season, then the first.
The show isnt even about killing and murder, it's about being a human being, and making choices that can affect not just you, but everyone around you. It's a show with some of the best characters i've seen on TV. I dislike none of them, and can actually feel something when they die.
If you look at Dexter the same way as Saw and Hostel, then you are not looking at it correctly. They are hardly related. Like I said, there's bearly any gore in the series aside from dead bodies, and spatter, plus, he kills people who deserve it. Like actually deserve it. Not like Saw.
If Jigsaw killed child molesters and rapisits, rather then some guy who litters all the time, then maybe the series would be interesting, and become really deep morality play about horrible people getting second chances. But insted it's normal douchy people getting hacked up for the smallest detail.
Which is quite funny because I couldnt find one decent character in Frankenstein for me to even like, or feel empathy for. So I'm not sure whats going on here.
I gave Frankenstein a chance, I didnt write it off before I saw it...I watched it twice, and my opinion was unchanged. So you should watch the first season of Dexter. If by then, you dont like it....then so be it.