Anyone who had been paying the least bit of attention to Obama's career before he became President would have noticed that he was a right of centre (American spectrum) politician far more interested in compromise and bipartisanship than ideology. His pro-big-business, pro-big-bank, pro-wall-street agenda was absolutely predictable from his career. Obama's bigger problem was the race based obstructionism he received from the Republican Party and the way the Republicans were able to leverage that racism so that even Democrats didn't want to be seen as pro-Obama. This racist obstructionism was also predictable and should have been expected."Hope and change" is a meaningless platitude that older voters should have seen through.
While Conservatives are very quick to talk about how unpopular Justin Trudeau is and how he has kept none of his promises, I happen to like him a great deal, as do all the liberals (e.g., NDP, Liberals, Greens) I know. This much ballyhooed disappointment of Trudeau is, in my opinion, mostly wishful thinking by the conservative press. He's doing a great job in a difficult world and I'm proud to have him as our P.M.
Sanders would have faced an even worse backlash than Obama had he have won the Presidency (the only thing worse than being a black man in America is being a "red" one). Almost every special interest and lobbying establishment in America would have fought him tooth and nail. Billions and billions of dollars would have poured into media advertising to prevent the scary "Communist" from getting any legislation passed. If Americans compared Obama with Hitler for signing legislation that provided adequate, affordable healthcare to tens of millions of Americans, I can imagine Sanders being compared with Attila the Hun and Chinggis Khan for providing universal healthcare, free college/trade school educations and higher minimum wages. Unfortunately, it's unlikely he could get anything done as President.
(For the record, I think quite highly of both Chinggis Khan and Attila the Hun, as political leaders go. I am simply recognizing their negative, and largely undeserved, reputations in the West.)