While Prime Minister Najib Abdul Razak may be enjoying a high popularity rating as he celebrates 100 days in office, his well-known supporter and former premier Dr Mahathir Mohamad brought the celebratory mood down to earth today with an unfavourable assessment.

Speaking to reporters in Kuala Lumpur this morning, Mahathir said Najib gained "more negatives rather than positives" since taking over as the prime minister from Abdullah Ahmad Badawi on April 3.

"I am sorry to say this, but there are more negative (things) rather than positives. Somebody said, there was almost nothing in positives, (especially) from the Internet. For example, there is no freedom of the press," he said.

When asked to elaborate the negative things that have been reflected on Najib, Mahathir claimed that Najib did not come up with any proper study relating to the third bridge linking Johor Baru and Singapore.

"There are also other things, like certain appointments of the (ministers) found to be corrupt and yet, they are still in office," he said.

Despite these, Mahathir said Najib did however manage to score a few positives.

"For example, he likes to meet people and secondly he does not sleep (on the job)," he quipped.