Given the average absurdist plot 99% of anime has you can't really judge it or tell if you'll like it from a synopsis, so I tend to ignore those.
But there are some things that I really need in an anime.
>Has a cute girl
Female attraction is a form of entertainment on its own. An anime without this would be missing an entire form of entertainment that can coexist with any others (plot, characters, etc) perfectly. Thankfully that's pretty much a given in anime.
>Looks pleasing to the eye
One of the many problems in western media today is how everything must be a disgusting mess that you definitely don't want to look at. I don't want to watch an anime with the same issue. Thankfully animes with this issue are few, and generally it's not very bad when it's there. For instance everyone has a disgusting chink face in Serial Experiments Lain, but I still watched it.
I couldn't watch Robot Carnival, because everything was simply crafted to be ugly, much like western media.
>Preferrably no computer animation, but absolutely no excessive use of 3D renders.
Overlord's 2nd and 3rd season have excessive use of 3D renders, and the entire series is computer animated. Just awful. But I've watched the first 2 seasons and plan to watch the 3rd which I've already read ahead of. I wanted to have some of the wish fulfillment isekai pie, and this was the one franchise I picked for it.
Computer animation may be bad, but everything is produced with it nowadays, so it's either that or severely limiting the scope of what you can watch.
>No "moeblob" art style
Urahara for instance is exclusively moeblobs. Just terrible.
>If it's CGDCT, that it at least be about something.
Usually comedy does the trick, but if a show isn't funny, then the entire thing falls through. At least try to have other redeemable qualities. Dagashi Kashi fails terribly at this, Kokonutsu (was that even his name? I forgot) is an unfunny boring protagonist with no redeeming qualities, and then you wait for the cute girls to pop up so the show has a chance, but they just try to sell you japanese candy.
That's what I can come up with before turning the computer off to sleep at 10am at least.