How to rate strength of starters faced?

Does anyone know a good way to look up and measure the strength of the starting pitching a team has faced?  I see lots of articles in the MSM about strength of the overall teams faced, but I would like to be able to break that down a bit more.  I'd like to simply separate the exact starters (and their stats, of course) in the games played series by series. 

Thanks for your suggestions...