Yes, the final election result wasn't terribly surprising given polling. Trump was reported to have a very nonzero chance of winning the electoral college all along (although there weren't many reports of him having a > 50% chance), and all polls had the popular vote being very close.
But what was surprising, all along, to people from all sorts of echo chambers (including, I think, Trump himself) was that Trump had this support in the first place. He was the goofball candidate in the primaries. Mitt Romney, the previous Republican nominee, called him a "phony" and a "fraud," and said, "He's playing the American public for suckers." Imagine McCain saying that about Romney, or Kerry about Obama! He dominated the news cycle for months with indiscretions and mistakes. He lost the debates, by any metric in which you care about actual policy discussed at the debates. Republicans were quite worried about him dooming the party. It was clear months before November that he was a realistic candidate who would win about half of the popular vote, but the fact that we got to that point was surprising.