Cooley has a very good reputation within the state.
I used to be the one who would call and invite firms for on-campus interviews (OCI) and resume collections (RC). The only human resources person who ever said anything about Cooley's reputation to me while I actively tried to recruit their firm was from California. All she told me was that she would take resumes, but from only the top two or three ranks. Every other firm I talked to, which was in the hundreds, would at the least look at the office's recruitment packages.
If this is accurate, why do only four Michigan firms attend OCI (numbers from NALP?)
I can't say why NALP only listed four Michigan firms, but if you did a recent search my guess would be that the OCI season hasn't hit full swing yet (and won't for a month or two) so there probably aren't very many OCIs submitted to NALP at this time. That doesn't mean there aren't more OCIs scheduled, I'd be very surprised if there weren't, I'm simply saying that NALP might not have been updated yet.
I know from first hand experience that we had alot more than four OCIs from Michigan firms in previous years.