If we wish to fairly evaluate the assertion of the OP it is helpful compare like things.
Consider the polling data that has been published by the Gallop organization. On 20 April 2017 Business Insider published an article on what were then the most recent data from the Gallop organization. The substance of the article was the average job approval data for the first quarter of the first year of all Presidents of the post world war two period.
The results for average job approval over the first quarter were as follows, from highest to lowest:
John Kennedy 74%
Dwight Eisenhower 71%
Jimmy Carter 69%
Barack Obama 63%
Richard Nixon 62%
Ronald Reagan 60%
George W. Bush 58%
George H.W. Bush 57%
Bill Clinton 55%
Donald Trump 41%
Link to the original article: http://www.businessinsider.com/trump-approval-rating-gallup-history-2017-4
In the posting of the Gallop data at their website further light is cast on the attitudes toward the current American President.
Trump won election using a campaign that flouted norms of political decorum and relied heavily on social media to spread his, at times, controversial messages. His unconventional style suggested his presidency would be like nothing seen before. And that has been true, but likely not in the way he or his supporters hoped -- with no honeymoon period to speak of and approval ratings far worse than any president has received this early in his tenure. On his best day, less than half of Americans, 46%, have approved of the job Trump is doing.
What it comes down to is this, President Trump is less popular than any President of the post war era, for the period of his first quarter.
Link to the Gallop article: http://www.gallup.com/poll/208778/trump-job-approval-first-quarter-lowest-points.aspx