Common sense, maturity, humility, and curiosity are all extremely important to me in a partner. Whether my potential partner is book smart is significantly less important to me than whether they treat others with respect and wanting to improve themselves.
With the superficial stuff out of the way, the bottom line is that the thing that matters most is whether or not I want to spend my limited time with them.
I am a massive anime watcher and I have this problem too. I used to binge watch a lot of shows, but as I’ve grown older I find I can’t project myself onto the characters anymore and I can’t relate to any of them. There is a severe drought of adult-targeted shows that aren’t pornographic or tragedy/horror in nature. It’s like adults are not interesting unless they are sexed up or murdered.
A lot of the good stuff has already been adapted (most anime are adaptations of some form of light novel or comic book), so in the past few years the production studios have been scraping the bottom of the barrel just to release something. It has resulted in a higher than average set of subpar works every season (3 months, 12 or 13 episodes).