Yes Thanos is technically human, a child of an Earth-born Eternal and a Space-born Eternal. Those from space lack the bonuses from exposure to the cosmic energy accident Cronos had so lack the exceptional powers of those from earth (although are still fairly powerful, as evidenced by Eros). They also don't seem to have any problems with incest or inbreeding, since they're all descended from Alars and Sui-Li.
Thanos however is a to-date one-of-a-kind mutant of the breed, as while they get the benefit of a number of powers that make them inherently more powerful than a normal human they also are so genetically stable that mutation is almost impossible. In contrast, or perhaps counterpoint, the Deviants are completely genetically unstable and mutate with each generation. Humans hold the point in between, with the potential to mutate to be far more powerful than either of their estranged brethren.
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