Tyres can be subjective in terms of feel, but everything else can be measured including; dry braking, wet braking, aquaplaning, dry laptime, wet laptime, max G force, road noise. None of which is subjective and is what I base my tyre choice on.
And comparing semi slicks like R888 that are normally for track focused cars isn't comparable with normal premium summer tyres that are used year round.
Michelin PS2's set the benchmark nearly a decade ago, Goodyear F1's soon became the benchmark, currently Continental hold the top spot (but the evo tests are held at the Continental proving centre..)
From what I've heard there's a LOT of praise coming for the soon to be released Michelin Super Sports which should be a step above the rest.
Tyres and brakes are an area I'd never touch with budget money. If I was to ever have an accident that ruins my life or another's I wouldn't ever want to think 'what if I didn't buy these budgets'.