I take it MC for the Mac is not ripping CD's yet, so you're bootcamping into Windows to rip the CD's and then back to OS X to import them into MC. As the files and folders are all properly named, you can use my suggestion to fill the properties from the file and folder naming structure. This way you won't have to work through all of them one by one, but can do them first in a small batch, then do the rest in one more go. Shouldn't be more than a few minutes work.
** Disclaimer: steps below are based on Windows version. I assume the steps will be the same or very similar. If you're unsure just ask and someone with the Mac version will help you on your way.
Open the Audio branch and select Files
Add a pane to the view with Filename (Path) if its not already there by right clicking a pane and select add category to left (or right). This pane allows you to select a folder on your disk and see the files that are in there.
Verify all tracks are there and select the track with the incorrect information.
Right click the selection, choose Library Tools/Fill properties from filename
Now, based on the folder and naming scheme used, you need to enter the fields. Example:
Folder and files are named as Bob Dylan/Blood on the Tracks/01. Tangled up in Blue.wav
In MC, you choose Template, tick both Directories and Filename. For Directory you fill in:
[Artist]/[Album]
For Filename:
[Track #]. [Name]
If the track numbers in the filename are separated by a space only, or a -, adjust accordingly.
MC will show the result in the right part, so check carefully. The bold text is what MC picks up as changes.
Try this with 1 file and see how that works. If it works out and you're comfortable with it, you can go back to artist/album view and select [unknown artist]. It should show all the first tracks for all your ripped cd's in a single view. Select a bunch of them, choose the fill properties from filename and review the changes its about to make.