Player Affinity writes: Eight films in just about 10 years and no rusty wands in the bunch — or however you wish to phrase it. The success of J.K. Rowling’s “Harry Potter” series theatrically has been unprecedented in both box-office receipts and critical success. Perhaps Warner Bros. and producer David Heyman are to thank for their careful supervision, or original director Chris Columbus for helping to envision a foundation for future success and casting three kids who proved as right for their roles at age 10 as they do at 20. Maybe it’s long-time “Potter” scribe Steve Kloves for finding a way to give both fans and studio heads exactly what they were looking for. Yet as the credits roll on Harry Potter and the Deathly Hallows, Part 2, the satisfying punctuation mark at the end of a true cinematic journey, it really all comes back to characters and storytelling — to Rowling.