To Aru Index hails from a time where being 15 and edgy was a relatively acceptable concept compared to now, after all it was 2008. Peoples views were quite a bit different and so were peoples tastes. Am I being biased here? Maybe.
You were probably told to watch Index first because you get to know the lore that way. But trust me it is not really worth torturing yourself with to get it. Touma is an insufferably annoying gary stu mc who never loses and the series tries so hard to play up as a badass, hes not sorry. Then there's the endless monologuing, would it kill the characters to stfu and fight instead of talking back and forth for minutes on end?
Alright there is some brief redemption from episode 12 to about 20 where we get a Misaka and sis arc and an Accelerator/Last index arc but after that it goes straight back to being comically bad again. When the scenes are good they are alright when they are bad oh boy are they bad, like an Uwe Boll film level of comically bad.
On the plus side the animation looks pretty good for an anime from 13 years ago so its held its ground well over the years. the plot sadly I cannot say the same. Just save yourself the torment and go watch Railgun instead. Touma pretty much drags the series down sadly.
