I am one of those guys who hated the INF that came in my Ibby S series. Staggeringly horrible. Worst stock pickups out of any of my guitars.
The 230 quid Dean 7 string? Not great, but usable. The 45 quid axe off ebay (newprize around 60 I recall)? Fizzy and weak, but not muddy and had a certain lowfi charm. Classic 57s in an Epi? Probably my favorite stocks so far. EMG HZ (passives) in my ESP-type LP? Usable for rock and could do a certain sound well. Wilkinsons in my Superstrat-ish? Muddy, but alright for low-gain. The Ken Armstrong HB in my headless Feline? Great, but not really what is meant here.
The INF were to me the absolute worst out of all of them. Just a muddy, undefined mess with no character. Fell totally apart under gain.
Weirdly enough one of my favorite bands, Protest the Hero, has on occasion played them and made em sound alright.