There is a small collection of graphics novel in Plymouth public library. I have just read
Captain America: The Death Of Captain America. This was the first graphics novel set in the DC universe which I have read, so I didn't know all the characters. I knew a bit about shield from the recent crap TV series.
I liked the grimy feel to the book and the sense of moral greyness. To be honest I should read it again to make sure I fully understood what was going on.