Well, noone expected him to win with such massive superiority in the electoral college (people tend to forget looking at the actual voters' count which is roughly 50/50) but it's a symptom and an important signal. As a European I am kind of glad it went exactly like this (the only other good result would have been a participation below 20%) because the signals are coming in. Brexit. Front National. AFD. Now this guy. People will happily vote for someone who has broken all rules of good taste and civilized ... well... existing, who has proven to be a total failure even in his non-political profession... just to, as You say it, "stick it to the man". It probably won't work at all, (maybe it will, the guy is just unpredictable enough to actually fokk up the big economic players active in the U.S.) but it tells the established political factions in the western world that they have to start getting their shyte together. And in Germany at least, they have started panicking and worrying yesterday morning. These are delicate times, if not war, then climate change and overpopulation will wreck our planet pretty soon. And the western culture is responsible. We invented and exported the ultimate "change" blockers, mass media, mass industry and automated weapons. Now we are just sitting here, not feeling responsible, while our core values degenerate and our political system has become little more than an administrative tool for the economy. People notice. People don't know exactly what went wrong, what is wrong, how to get out of it, but they notice something is severely broken. And I sincerely hope the Trump election will make it a necessary point on every party's agenda to demonstrate that they can control the economy. At least. And at some point maybe actual western culture will be reinforced, instead of the choice between slightly idealized plutocracy and dumb nationalism. Right now I think it's not yet too late (sorry U.S., You'll have to deal with classic republican nonsense again for four years, but meh, You'll survive) but this boot in the face of "reason" might just be enough to wake up our own leaders over here.
Then again, nobody took Stalin seriously, and the German industrialists thought Hitler was a clown and easy to control. Especially with the latter, he also rose to popularity after a period of liberalism and reason, that just did not manage to properly repair the country quickly enough. We'll see.