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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.
Watched the series Bosch and really like it. I'm gonna have to check out the books.
