http://www.sportingnews.com/nfl/100/91.html
They ranked him 91 of the top players in history and give a nice article it is on the site but i'll post it below:
His name rolls off the tongue softly, quietly, befitting the man it identifies. Art Monk is almost as proud of his relative anonymity as he is the record-setting numbers he compiled over a 16-year NFL career. He was Washington's Quiet Man, the go-to wide receiver for four Super Bowl teams. When Monk spoke, it was usually with tough catches in the clutch moments of big games.
Big (6-3, 210) and physical, Monk was a wide receiver in a tight end's body. Unable to dazzle anybody with his speed, he became a route-running technician who would go outside or inside with fearless defiance. Nobody was more consistent on medium routes over the middle, football's no-man's land of broken ribs and shattered careers. Third down and other key situations belonged to Monk, who turned cornerbacks around with his quick moves and long, graceful stride. He also was adept at positioning his large body to seal off smaller defensive backs before gathering the ball.
Nothing came naturally for Monk, who spent countless hours on the practice field and many more behind the projector. The workmanlike dedication paid off in consistency and earned the appreciation of understanding Redskins fans. Monk, who spent most of his career trying to avoid the spotlight, gained reluctant acclaim in 1984 when he caught 106 passes, a season record that stood for eight years, and in 1992 when he passed Steve Largent and temporarily became the all-time receptions leader.
Throughout a career that ended in Philadelphia in 1995 and produced 940 catches for 12,721 yards and 68 touchdowns, Monk was seldom mentioned among superstar receivers. Despite five 1,000-yard seasons and a then-record 183 straight games with at least one catch, he was named to only three Pro Bowl teams. But those who worked with Monk appreciated his value. "Quiet about his work, very loud with his results," former Redskins quarterback Mark Rypien said.
JUst for reference
1- Jim Brown. 2- Jerry Rice 3- Joe Montana 4-Lawrence Taylor 5-Johnny Unitas
Sammy Baugh didn't break top ten but is number 11
Ken Houston-61 Sam Huff-76
Darrell Green-81 Charlie Taylor- 85