Some of it did turn out to be true. A few things were confirmed to be false, and quite a few of the more salacious ones remain unconfirmed either way and will probably remain that way. Considering the very guilty looking connections that the whole Trump orbit had with Russia, it's a wonder it didn't get even more traction.
I mean, the president's son and campaign official sent an email to Trump's campaign manager inviting him to a meeting with a woman connected to the Kremlin. Multiple officials have gone to jail for Russia connected or Russian adjacent crimes. His national security advisor had secret unofficial meetings with Russia. He also accepted tens of thousands of dollars from a Russian government news organization to give a speech just a few months before becoming the national security advisor (he was even photographed sitting at the head table with Putin).
There is nothing in the Steele Dossier that seems out of place, out of character, or even unlikely. Much of it is unconfirmed, but it all fits into the official and true narrative from what we know do far.