I see there's an anime talk going on.
I too enjoy Attack on Titan; I'm even caught up with the manga for it (couldn't bear waiting for season 2 after finishing the first season, not to mention I find myself drawn to the titan mystery); in fact, it's the only manga that I actively read. I can agree that the series isn't perfect and has its flaws.
Out of all the anime series I watched (a handful to be exact), my favorite anime series definitely has to go to the Fate series, particularly the ufotable adaptations of Fate/Stay Night UBW and Fate/Zero, though if I had to pick between the two, I'd go with Zero.
Speaking of which, still waiting for more updates about that Heaven's Feel adaptation, ufotable.