Here is what I do using linux and cb2bib.
- Open up cb2bib and make sure that clipboard connection is ON, and that your reference database is loaded
- Find your paper on google scholar
- Click 'import to bibtex' underneath the paper
- Select (highlight) everything on the next page (ie., the bibtex code)
- It should now appear formatted in cb2bib
- Optionally now press network search (the globe icon) to add additional info.
- Press save in cb2bib to add the paper to your ref database.
Repeat this for all the papers. I think in the absence of a method that reliably extracts metadata from PDFs, this is the easiest solution I found.