Ned: I liked his chapters because they are the ones with most plot progression in the first book but other than that I don't have much impression on his plot. RIP.
Arya: Quickly became one of my favorites. There's just something about her monologue that I really find entertaining. Her plotline feels the most adventure-ish (pretty dark adventures though) and I like that. Looking forward to see what this little killer does next.
Cat: I didn't have any strong opinions on her at first but since she came back from the Eyrie I haven't cared about her. Like, I like her chapters and reading what's happening around her but I find her monologues to be dreary and boring.
Sansa: Her early chapters in AGoT were my least favorites but I liked her more later on, but later on in ACoK I once again didn't like her chapters during the Battle of the Blackwater very much.
Tyrion: For a deformed dwarf this guy sure gets lots of battle scenes, pretty sure no other POV gets this much action. I find his chapters enjoyable and I liked his intrigue at the court a lot but I fear I might be getting a bit sick of his quips.
Jon: He feels like the closest to a typical fantasy protagonist. I really like the wall plot and the folks there. His chapters are one of my favorites together with Arya.
Theon: Annoying guy but the way how everything starts to go wrong with his plans make him kind of pitiful in a pathetic way.
Daenerys: While I don't dislike Dany her chapters can a be chore to read sometimes. The first problem is how her plotline feels detached from the greater plot at the current moment, the other is how everything around her feels so shallow compared to Westeros from places to people. Jorah feels like the only actual character in her chapters other than Dany herself. Her chapters feel like overly 'mc-centered' compared to other POVs. I liked her plotline in ACoK much better than AGoT because it was much shorter and because Qarth was actually kinda interesting.
Bran: Probaly my favorite after Arya and Jon. Much like Arya there's something about his monologue that I find enjoyable to read.
Davos: He's a alright guy I guess? He seems to be there just to provide insight into the Stannis faction and the best moments in his chapters were him talking with Stannis. I am more interested in Stannis himself and Melisandre to be honest.