It does indeed seem that most of them are just errors made while creating the users.
I guess to be safe I'll do it in 3 parts, 1st is to create the directories that are defined in the passwd files and 2nd part will be to check the users with no homedir in the passwd and see whether the homedir actualy exists, if so then adjust the passwd file.
3rd part will be to manually go over the rest (those with no homedir defined in both conditions)... just to be on the safe side in case there is cause for such weird setup.

Cheers for your input!