Adaptive Helm feels terrible to play against, and is targeted vs champs that are already bad
i feel that adaptive helm is a situational item then targets specific champions and negates non-meta champions damage significantly, making lacking champs feel even worse. Eve Q, Fiddle drain and crowstorm, Heimer tower damage, Karthus E , Kat Ult and Shunpo reset, Kayle E basic attack, Kennen ult , Lissandra Q , Malzahar E and R, Rumble flame thrower and ultimate, Taliyah Q, Teemo poison and shrooms, Velkoz ult, Viktor ult and E evolved , Xerath ultimate, Ziggs Q and E, Zyra plant damage, singed Q, Cas E. These champs aren't nuking solo Q in anyway, as i said it adaptive helm is targeted towards these bad champions making games even harder for them and feels shitty to play against.
reduces all crit damage to 80% and slows total as by 15% for a second if autoed ( Even has a nice active that slows in 550 range(average auto range of adcs) that slows for 2 seconds at 55%) or the cheaper version called 
reduces all auto damage by 10% to everything but towers (Doesn't reduce on hits). If you wanna reduce ADC lifesteal to 0% effectively theres this lovely item caleld 
that also comes with randuin's as passive slow of total by 15%. If you want reduce ADC dps without being attacked theres 
that removes 15% total as in an aura(It stacks with randuin's or thornmail AS slow up to a potential 27.75% total as slow).
