At least until the fifth Host, and we've no idea how many tests go by before they leave you alone. They did though judge against Earth due to the High Evolutionary's success in the what-if for the Evolutionary Wars (although by the time that they noticed normal humanity had evolved to the point they were able to rival Eternity in power and easily destroyed Arishem which sent the other Celestials running in presumed terror). Hard to know what kind of criteria that they judge by or what it takes to satisfy them, although I think Gaeia must know considering she was instrumental in creating the Young Gods and presenting them as suitable examples of mankind's being able to meet their goals. So apparently how you 'defeat' them is by proving worthy at which point they go away.
I'm not sure though if humanity had 'unrivaled potential', the 'normal' skrulls might have had the same potential but the deviant ones with their starting powers wiped out the normals before we could find out. Looking at the backstory on Earth the Earth Deviants almost did the same thing several times and only Celestial intervention gave normal humans a chance to reach the point that they're at now. So perhaps the only difference between normal humanity and normal skrullians was the skrullians didn't get Celestial intervention to rescue them like 'we' did (perhaps because once they were a dead-end they abandoned the experiment, much like they did Thane Ector's people).
"A shared universe, like any fictional construct, hinges on suspension of disbelief. When continuity is tossed away, it tatters the construct. Undermines it."
-- Peter David
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