I take your point that more information would be usefiul, but its not that easy.
The process is multi-threaded so two checks can be going on at one time, at some points in the process it is actually checking a release, another times individual songs, a song can be checked more than once during different criteria.
The count you see is a count of songs that have been successfully matched.
At first I ran auto correct over a large number of files and it sat at this screen for 20+ minutes. i thought it had crashed and restarted the app a couple of times until I tried it one last time and left it over night where it did end up finishing so maybe just a status bar to indicate something is actually happening.