It all depends on what you saw during the 80's and how you came out of it.
If you're sat in a comfortable job, with a decent salary and you never witnessed the devastation of the 80's, you've probably swallowed monetarist policies hook line and sinker, you will also believe that it was Labours spending on the welfare state, and not the International Banking Crisis that crashed our economy. And you'll think Corbyn's calls for a fairer society just mean that he wants more of your money to spend on the workshy.
Whereas if you saw the 80's as a decade that completely wrecked our society and set us up for the inevitable crash in in banking. If you can see that most people 'in work' are struggling to get by, and that they no longer have any control of their own destiny (we're leaving it to the markets - it'll be fine), if you can see that Socialism only exists for City fat cats and bankers because we can't afford for them to fail - no matter how much of an arse they make of the job.
Then you might see the that what he's talking about is a radical new look at economic policy rather than going for the easy option and maintaining the status quo, the fact that
40 senior economists seem to think he has a point ought to make people take him seriously.
But then the fact that we re-elected a government who had no plan to reduce the deficit, but made a promise (that they'd already made and broken) doesn't bode well for convincing the electorate.