I thought the show was decent, but a couple things annoyed/disappointed me.
For one, the main villain was really cliched and seemed fairly incompetent. I don't know how many times I've seen the ruthless-deluded-psychopath-rich guy villain, but it's getting kind of dull. What I really would like is if the villain was a ruthless, successful business who was actually very cold and calculating. The outbursts of rage are pretty silly and it really makes me question how he got to be in charge of anything.
My bigger issue with the show is how repetitive it was. Towards the end, every episode was 10-15 minutes of Fisk talking about how he wanted to save this city, cut out the decay of this city, and other crap about "this city". Seriously after the first couple of times of listening to his little spiel, I understood it. No need to keep beating me over the head with it. The same thing goes for everyone warning Daredevil to not kill anyone; some dialogue happened in just about every episode of someone telling him not to become a monster or some bs. I understand that its a central theme to the show and all, but there is something to be said for subtlety. It started to become aggravating towards the end.
It also doesn't help that I think treating all killings as equally wrong to be a pretty childish, black-and-white view, and that it's a recurring view held in almost every single superhero show.