The Australian, who retired in 2013, feels the number of 'pay drivers', such as Sauber's Felipe Nasr and Marcus Ericsson, is not good for the sport.
"These guys are on a phenomenal level but the depth has never been weaker," Webber told BBC Radio 5 live.
"We need to get the calibre that we have at the front of the grid. We need more depth and the cars to be faster."
Pay drivers bring sponsorship to secure a seat in order to help their team reach its annual budget.
Webber added: "If you go from the top 10 back, there are a lot of pay drivers. This is not good.
"The physical components are the lowest it's ever been. It's like a rugby tackle but 30% softer."
