How many episodes do you need to watch in general to know if an anime is for you or not? And how many episodes are you willing to grind (despite them being mid or bad) hoping that it'll get better?
I feel like the more stuff I watch, the less endurance I got. If I'm watching two episodes and I'm bored or not grabbed by the narrative, I just give up now (looking at yall God of Highschool and HxH)
enough time to know where the show is going and if I'm interested in that direction. in the case of a Texhnolyze, at least interested in finding out what it's about and will stick around until that shoe drops.
sometimes cult popular shows are fun to watch even though I'm uninterested in the direction. Mainly so that I can at least talk about them with people who do and not sound like an ignorant hater. Want to be able to say "I dislike this anime for x reasons, BUT I understand why you like it for z reasons"
then there are shows that are meh adaptations of a more thorough source material. If I can recognize that, like in God of High School that cuts out details and doesn't deliver the visual impact of the manwha (did a cross comparison of several episodes) I'm likely to drop it and just read the manga.