The LA Times/USC poll had Trump winning the popular vote 46.8% to 43.6% in its final forecast. I have no idea how that is viewed as accurate. It was more than 5 points off, or worse than perhaps any other major poll.
Nate Silver was easily the most astute polling pundit in 2016, when he continually emphasized that while Hillary was favored it was shaky favoritism and not even close to what Obama enjoyed in 2012 or that most analysts were assigning to Hillary.
Anybody who thinks Trump was favored or supposed to win has zero credibility. His own camp was shocked to win. The guy who put together that LA Times poll admitted he was stunned that Trump won. There are reports that Trump told Melania don't worry we can go back home soon because I'm not going to win. That's why she looked anything but happy on election night on that stage.
There are upsets in politics just like everywhere else. As I emphasized on progressive sites throughout fall 2016, Hillary's favoritism was only the equivalent of a 5 or 6 point favorite in an NFL game. That is not much of anything.
Anyone who criticizes or doubts Nate Silver is an ultimate moron. Check out this video from a few days prior to the 2016 election. Nate nails everything in terms of how the terrain differed from 2012. He had Hillary at only 65% compared to Obama four years earlier at 85%. Nate describes Hillary's comparative weakness in the midwest and among white non-educated voters. He ticks off state by state comparing Hillary's deficits in relation to Obama's leads. Nate said Hillary was only one state away from losing the electoral college while Obama had considerable margin for error there. This video doesn't cover it but Nate wrote on his site a week or so before election day that a small polling error in the vital swing states would likely attach to all of them in the same direction, and if it is in Trump's favor he's the winner.
Sorry, I'll go with Nate Silver every time and allow others to take subjective partisan stabs that based on their bias. I've wagered on politics since 1992. It was easy pickings until Nate came along and brilliantly changed the spotlight and the understanding of key variables and how they interract. You no longer have isolated websites sticking up stupid odds based on subjectivity, alone which happened as recently as 2006, pre-Nate Silver. Nate had Hillary favored just like Jimmy the Greek and anyone with a functioning brain cell had the Colts heavily favored over the Jets in January 1969. The fact that someone predicted an upset doesn't impress me at all. I lived in Las Vegas for 25 years. There were always loudmouths forecasting upsets and crowing about it. We laughed. If they were using flawed rationale it meant nothing. Invariably they would apply the same tortured thinking to the next game, and the next game, and end up broke, then wobbling out of town on a bus.