I think humans are one of the less successful viruses in history;P Calling us successful at clinging on to this rock, time will show.
idk how you'd judge success in this case but humans are likely the only 'virus' that has spread to such diverse environments & have a 'lifetime' OOM more than other viruses.
Plenty of animals, bacteria and plants that outclass humans in everything but one single thing: Going to the moon/space /running. But Tardigrade can live in space, so there is that:P
the quote called life a virus, not just humans. but while on the subject you could say humans cant compete with literally all life but against any single species we'd be most