As shown in the first attachment, I have some mp3s for a japanese artist, and one of the tracks spotify wrongly associates it with a completely different track. the title of the track isn't even the same (it is "Please Please", all other details are the same as the surrounding tracks). This I could put up with no problem as it still plays the mp3, the annoying thing for me is that it scrobbles the wrong track to last.fm when i listen to it.
The 2nd attachment shows another smaller issue, as they actually match to the correct tracks (even though the spotify linked ones are singles rather than the album) but also provides the same scrobbiling issue since the artist and album names are in english rather than japanese like I have in the id3 tags.
An advanced option to prefer local file metadata over spotify metadata would be king here!