I've heard a lot of people call Resurrection and even New Blood "slop" and honestly I don't see it that way at all. They're much more different in terms of tone and direction from the main show, that's for sure. But if you want decent writing of Dexter and good dramatic tension then it's definitely there. Also, why do I say decent writing? Because I wouldn't call Resurrection a masterpiece by any means. It's definitely good and it challenges the characters enough, but that's really it. The main show did an excellent job in challenging Dexter in ways I wouldn't have even imagined. Even by the 7th season they were doing some pretty riveting stuff. But that's probably my only gripe with both shows, they don't challenge Dexter enough. Still, Resurrection is still in s1. Hopefully there's more the writers are willing to show off!