I was thinking just now, about what are the qualities that make a series rewatchable... It's not average quality... never rewatched Full Metal Alchemist, nor Wolf's Rain, even tho I consider them 2 of the best things I've seen, but I still rewatched Banner of the stars more than 5 times. It's not absence of backbone plot. Sure, I've rewatched a couple of Mushishi bits here and there, but very few, and I never rewatched Bebop. Also 2 great production. And I still rewatched Excel Saga a lot of times XD It's not soundtrack. I didn't rewatch Tsubasa Chronicles, I didn't rewatch Wolf's rain... But I still rewatched Last Exile .... god knows how many times lol. It's not number of episodes. Never rewatched Area 88 (small), never rewatched Twelve Kingdoms(Large lol) But I did rewatch FLCL many times (small), Haibane Renmei(small) AND Fate/stay(largish.. ok normal) And keep in mind all of those are great series, as far as I'm concerned. So what is it for you that makes a series rewatchable?