You're wrong SS.He's Class 100, he's hella strong sufficiently to withstand with the heavyweights of the Marvel Universe.
I don't have the exact issue numbers, but awhile before Onslaught, during his tenure with the Avengers, Zeus stripped him of his immortality (including some of his strength), banished him from Olympus and exiled him to Earth because of Hercules fondness for mortal affairs. At full power he's Class 100 and able to duke it out with the best of them, but currently, he's not at full power.
Though I think Frank Tieri (who's writing the new Herc mini-series, with art by the awesome Mark Texeira) said he's just going to ignore that and write him at full power. In either situation, he'd beat the Thing.