I like POV changes, if done skillfully, both as a reader and a writer. I often write series where the POV changes from chapter to chapter.
I think canon believability is very important. I do feel fic has to go beyond canon or we might as well just reread/rewatch canon. It's the fanfic author's job to convince the reader that this could be canon. I'm not sure if that's what you mean by "canonicity" though. Some people decry slash as anti-canonical, but I see it as extra-canonical if done well, which all fanfic is.
Egregious misspelling or grammar/punctuation errors will make me stop reading a fic. Errors in the *title* will prevent me from reading the fic. In my main fandom (X-Men) there are a bunch of writers who misspell characters' names, which I find beyond sloppy. "Rouge" for "Rogue" is pretty common. Another one is Scott "Cyclops" Summers, who is sometimes called "Summer" - I guess on the assumption that the final S in his name is plural?
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I think canon believability is very important. I do feel fic has to go beyond canon or we might as well just reread/rewatch canon. It's the fanfic author's job to convince the reader that this could be canon. I'm not sure if that's what you mean by "canonicity" though. Some people decry slash as anti-canonical, but I see it as extra-canonical if done well, which all fanfic is.
Egregious misspelling or grammar/punctuation errors will make me stop reading a fic. Errors in the *title* will prevent me from reading the fic. In my main fandom (X-Men) there are a bunch of writers who misspell characters' names, which I find beyond sloppy. "Rouge" for "Rogue" is pretty common. Another one is Scott "Cyclops" Summers, who is sometimes called "Summer" - I guess on the assumption that the final S in his name is plural?