The late Queen, who reigned for 70 years, enjoyed a popularity rating of around 75% prior to her death last year, according to YouGov
King Charles, in comparison, has a popularity rating of just 55%, while his popularity rating before he became king sat even lower - at around 44%.
Now, an exclusive Savanta poll for Yahoo News shows that nearly half of British people think King Charles will be less successful than his mother - and only 14% believe he will be much more or slightly more successful.
Around 1 in 4 (27%) of respondents said they believe Charles would be equally as successful, while 28% said he would be slightly less successful, 21% said he would be much less successful, and a further 10% said they did not know.
Questions over the future of the monarchy have been raised in the wake of Queen Elizabeth's death, with republicans taking the opportunity to raise their objections to the status held by the Royal Family.
King Charles has been faced with several anti-monarchy protesters at events, with many people arrested for demonstrating following the death of the Queen.
One royal expert commented on Yahoo's 'Future of the Monarchy' panel that the new king must tackle negative perceptions of the family - including historic grievances over his divorce from the late Princess Diana.
"There are still quite a few people who are still not very happy to see Camilla become Queen Camilla, who still have not forgotten the '90s and the war of the Waleses, you know that is still something that a lot of people do care about," said royal commentator Afua Hagan.
"The popularity that Queen Elizabeth II had is not going to automatically transfer to King Charles for many reasons - and one of the reasons will be his relationship with Camilla, what happened with Princess Diana,- that still plays out for a lot of people and I think it's a lot more people than perhaps we realise.
"So all these things together make for this dysfunctional family, so he needs to be very worried about how the royal family is eating itself and destroying itself from the inside. If he wants the royal family to remain popular, he's going to have to neutralise some of these things."
And the coronation has further divided public opinion, with the bill for the event expected to top £100 million, and recent polling from YouGov showing that 52% of Brits are not interested in the coronation, with just 15% saying they are very interested in the event.
"When only 15% are enthusiastic about the coronation and - according to other polls - more than 30% want the monarchy abolished, it's hard to claim this is a national celebration. Or that we're a nation of royalists," explained Graham Smith from campaign group Republic, which will be out in force protesting the coronation.
"Of course, it's easy to be fairly interested even if you're also fairly indifferent to the monarchy. It's a big event that's being endlessly promoted with few critical voices being heard on TV and radio. But that's a far cry from the national enthusiasm and celebration being projected by some in the media."
"The picture is clear: we are not a nation gearing up to celebrate the coronation - and that's a good thing. Most of us aren't that interested, and most of us think the royals should pay. A growing number of us want the monarchy abolished."