Webb was a really, really good pitcher. It's a shame that his career took a nosedive at such a young age.
With a minimum of 1,000 IP, only ten pitchers in have averaged at least 5 WAR per 200 IP:
Clayton Kershaw (active)
Most Underrated:Al Simmons, Keith Hernandez, Carlos Beltran
Most Overrated: Kirby Puckett, Catfish Hunter, Jack Morris
Most Overrated for being "Underrated": Bobby Grich, Gene Tenace, Alan Trammell
Most Underrated for being "Overrated": Roberto Clemente, Derek Jeter, Cal Ripken Jr.