I finally finished the season this weekend. Overall, I thought it was really good. It hits all the right notes of the character, the fights are intense and well-choreographed, and the supporting cast is fantastic. The biggest difference it has from comic book movies is there is more time to focus on the characters, which is also the season's biggest strength. The actors playing Matt, Karen, Ben, Wesley, Stick, Elena, Claire, the priest, etc. all do a really good job. Although he's far from the best actor on the show, former Bash Brother Elden Henson comes across as a charming Foggy Nelson. The best character in the show by far though is Leland Owlsley (played by Bob Gunton) because he just doesn't give a fuck. Killing him off was a travesty.
My biggest issue with the first season is D'onofrio's performance as Wilson Fisk. You would think that someone with his power and connections would be personable and charismatic, but he comes across as the opposite. D'onofrio speaks in short bursts with an unnaturally gruff voice and his most common facial expression is one of constant pain. He's not so much intimidating as he is awkward.
Also, there is a fine line between superhero costumes being cool and campy. Unfortunately, the suit in the final episode is closer to being the latter.