The opposite in fact, while the idea of SI is good, it's probably the worst subgenre of fanfiction. SI's are representations of usually immature authors and their wish fulfillment, they either won't meet your expectations and waste their powers and knowledge or they will be full of annoying flaws like anxiety, panic attacks and more. Most of them will hide who they are and what they know from the good guys for no reason(there are a few dark fics where this is justified though)
Thanks for the additional info, but I was thanking the one who replied to me because of the new abbreviation I learned.