Though who the top 10 best rookies ever in the past 25 years is very debatable, it can definitely be said who the top rookies have been at each position.
As such, I'm going to make my own list.
QB: Dan Marino, Dolphins. Although Marino didn't start until game 6, but he had the highest completion rate (58.6) and QB rating (96.0) by a QB ever. Honorable mention: Ben Roethlisberger.
RB: Eric ****erson, Rams. ****erson still holds the rookie records for rushing yards (1,808), attempts (390) and touchdowns (18). Honorable mention: George Rogers.
WR: Randy Moss, Vikings. Moss had 69 pass receptions for 1,313 yards and 17 touchdowns. His receiving prowess helped lead the Vikings to a 15-1 record. Honorable mention: Anquan Boldin
TE: Jeremy Shockey, Giants. Shockey had the most receptions and yards ever (74 and 894) by a rookie TE. Shockey made the Pro Bowl that year. Honorable mention: None. No other TE has had a glorious rookie year.
DE: Jevon Kearse, Titans: 14.5 sacks as a rookie. Period. Honorable mention:
DT: Dana Stubblefield, 49ers. Stubblefield had 10.5 sacks as a rookie and helped lead the 49ers to the NFC Championship game. Honorable mention: Tim Bowens.
OLB: Lawrence Taylor, Giants. Taylor had 133 tackles and 9.5 sacks as a rookie, helping to lead the Giants to the playoffs after going 4-12 the previous year. Honorable mention: Shawne Merriman.
MLB: Brian Urlacher, Bears. Urlacher hit the league by storm and had 165 tackles and eight sacks as a rookie, earning him a trip to the Pro Bowl. Honorable mention: Mike Croel.
CB: Ronnie Lott, 49ers. Lott had 7 interceptions, 4 forced fumbles, 89 tackles and only one touchdown against in 1981. Lott's solidity in the secondary helped lead the 49ers to a Super Bowl title. Honorable mention: Charles Woodson
S: Mark Carrier, Bears: Carrier had 10 interceptions and 5 forced fumbles in his rookie year at Buddy Ryan's "X" position in the 46 defense. Honorable mention: Erik McMillan.