So... is Cleanse worth like... 300 gold?
Because compared to
it loses 35 MR;
has 25 and costs 450g, which means MR on QSS is worth 1.4× that = 630g, that leaves the QSS active at 670g (with 1 300g cost).
QSS cancels Suppression (not sure if Airborne as I never play AD champs), but Cleanse cancels Ignite/Exhaust so I'm gonna not take away nor add any gold value to either of those.
Which leaves us with the last factor which are the cooldowns; QSS having 90s and Cleanse having 210s CD - which makes Cleanse's CD 2.3× QSS's, which makes it's worth 291g.
Ladies and gentleman, "super powerful high impact spell", the only option for APs that need to sacrifice an offensive slot for that, compared to the easiest item to obtain for ADCs that's also allowed to be built further into a decent offensive item (no slot wasted) with even better active.
on lane.
What would suit you better? Bonus damage or the ability to completely make his only hard cc useless?