Schliemann was the first "modern" archeologist, on a hunt for proving that something ( in this case Troy ) had actually existed. Modern methods and techniques hadn't yet come about, so yes, he was a "BULL IN A CHINA SHOP", in his ham handed search. Still and all, he DID prove that there had been cities on that spot, wars and a great fire destroyed what was left of the buildings on that site, and the jewelry he decked his wife in, is an amazing find; though those jewels were probably from a later date than the sack of Troy, in The Iliad.
He did. And he dug the citadal at Mycenae, which no one had been interested in doing, and found burials from the Heroic Age, and gave the name Mycenaean to that whole pre-classic period of Greece. He almost made it a hat trick by excavating Knossos, but couldn't quite strike the deal. Had he managed to do that, it would have been, well, historic. :^)