If you're looking for easy reading series with good characters (detectives/police), try John Sanford's Lucas Danvenport and Virgil Flowers series. Entertaining, humorous, fast reading. If you want something a little darker, with more damaged - but realistic - characters, it's hard to beat Michael Connelly's Harry Bosch and Mick Haller.
You'll want to live John Sanford's characters' lives. Connelly's characters' internal struggles will ring familiar to most of us.
Scott Pratt has a pretty good series that are published on Kindle (and so much cheaper). Mark Gimenez does too. Gimenez has a style that can be annoying if you read too many in a row.
If you can find any of George Pelecanos' book "on sale" on Kindle, you might like him too. Gritty, realistic.
I've seen those books a lot but never read any Griffin. Tell me more? I read on my Kindle mostly. Also I know nothing of Baldacci. If you haven't read it, I suggest 11/22/63 by Stephen King. I love King and this is one of his best. The series on HULU was excellent.