Outside of Luck at #1, the QBR rankings seem pretty legit to me. I would imagine that because he throws more short, high-percentage passes, probably hasn't gotten sacked much, and only has 4 INT's, that the numbers seem skewed.
RK PLAYER PASS EPA RUN EPA SACK EPA PEN EPA TOTAL EPA ACT PLAYS QB PAR QB PAA TOTAL QBR
1 Andrew Luck, IND 16.4 8.6 -1.7 2.3 25.7 148 29.2 17.0 81.9
2 Ben Roethlisberger, PIT 41.2 -1.0 -5.8 -1.3 33.0 149 28.3 15.9 80.4
3 Matt Ryan, ATL 37.3 5.5 -11.3 0.9 32.4 178 33.4 18.6 80.0
4 Andy Dalton, CIN 24.0 1.5 -5.9 4.9 24.5 162 29.2 15.7 78.3
5 Peyton Manning, DEN 24.9 0.6 -4.5 2.5 23.5 185 32.0 16.6 76.7
6 Tom Brady, NE 38.0 0.9 -6.6 -0.6 31.7 178 30.7 15.9 76.6
7 Matt Schaub, HOU 19.3 -0.4 -3.6 1.5 16.8 140 22.9 11.3 74.3
8 Alex Smith, SF 19.9 -0.5 -6.1 3.1 16.4 147 21.5 9.3 69.8
9 Joe Flacco, BAL 30.6 0.0 -6.2 5.1 29.5 198 28.9 12.5 69.7
10 Christian Ponder, MIN 20.8 -0.5 -4.3 2.2 18.3 152 21.8 9.2 68.9
RK PLAYER PASS EPA RUN EPA SACK EPA PEN EPA TOTAL EPA ACT PLAYS QB PAR QB PAA TOTAL QBR
11 Robert Griffin III, WSH 22.7 2.9 -6.9 6.9 25.7 191 27.3 11.4 68.7
12 Jake Locker, TEN 14.0 0.2 -1.8 1.9 14.3 130 18.4 7.6 68.5
13 Philip Rivers, SD 16.3 -1.1 -3.3 3.0 14.8 154 21.8 9.0 68.4
14 Eli Manning, NYG 22.3 -1.8 -3.0 3.9 21.4 184 23.1 7.8 63.7
15 Carson Palmer, OAK 18.7 -0.6 -2.7 4.8 20.1 191 23.6 7.7 63.1
16 Aaron Rodgers, GB 25.7 5.4 -11.8 3.6 22.9 208 24.2 7.0 60.9
17 Matthew Stafford, DET 20.9 1.8 -6.1 3.5 20.1 200 22.1 5.5 59.1
18 Cam Newton, CAR 15.6 1.5 -4.7 0.5 12.8 158 16.9 3.8 57.9
19 Michael Vick, PHI 23.8 5.1 -8.3 -0.1 20.6 206 20.5 3.4 55.4
20 Drew Brees, NO 23.5 0.1 -8.3 0.1 15.4 218 20.6 2.5 53.8
RK PLAYER PASS EPA RUN EPA SACK EPA PEN EPA TOTAL EPA ACT PLAYS QB PAR QB PAA TOTAL QBR
21 Ryan Fitzpatrick, BUF 8.3 3.6 -2.8 -0.3 8.8 148 13.7 1.4 53.3
22 Ryan Tannehill, MIA 14.8 -0.1 -5.7 3.4 12.4 173 13.8 -0.6 48.9
23 Matt Cassel, KC 11.3 1.1 -4.8 1.4 9.1 193 15.3 -0.8 48.7
24 Tony Romo, DAL 19.5 -0.3 -6.0 -2.6 10.6 186 13.7 -1.7 47.0
25 Blaine Gabbert, JAC 12.1 -0.4 -7.4 4.0 8.2 154 10.0 -2.7 44.2
26 Jay Cutler, CHI 11.0 0.3 -6.7 1.9 6.4 154 9.6 -3.2 43.3
27 Kevin Kolb, ARI 21.4 -0.5 -15.5 3.2 8.5 204 11.8 -5.2 41.7
28 Sam Bradford, STL 22.1 -1.4 -13.4 -1.6 5.7 183 8.0 -7.2 37.3
29 Mark Sanchez, NYJ 9.8 -5.5 -4.6 3.6 3.4 153 6.3 -6.4 36.5
30 Josh Freeman, TB 8.1 -2.3 -5.2 1.2 1.9 151 4.5 -8.0 33.1
RK PLAYER PASS EPA RUN EPA SACK EPA PEN EPA TOTAL EPA ACT PLAYS QB PAR QB PAA TOTAL QBR
31 Russell Wilson, SEA 3.2 -2.2 -6.0 5.4 0.4 158 3.2 -9.9 30.4
32 Brandon Weeden, CLE -8.6 -4.3 -6.2 0.1 -19.0 196 -16.2 -32.4 10.1