The boys at Mopupduty.com show that Wells ranks worst among CF in the MLB.
Vernon’s UZR/150 (zone rating over 150 games) is an MLB CF worst -31.9. To put this into perspective a few players are tied for second down at -12ish... Wells’ fielding has cost the Jays 21.3 runs vs an average fielder this season. This is second worst in the MLB, only -0.3 less than Adam Dunn’s -21.6 fielding runs.
My fucking God! Sweet fucking Jesus! Adam Dunn?
Christ.
The article is worth a read.
Update: Thanks to FanGraphs, I've tracked down the complete fielding number for CFs in the MLB:
| Team | UZR/150 |
| Blue Jays | -29.6 |
| Braves | -13.2 |
| Orioles | -12.8 |
| Phillies | -12.4 |
| Indians | -11.5 |
| Nationals | -10.4 |
| Red Sox | -9.7 |
| Mets | -8.3 |
| Diamondbacks | -6.9 |
| Astros | -4.8 |
| Rockies | -4.1 |
| Angels | -4.1 |
| Twins | -3.2 |
| Cubs | 0.7 |
| Pirates | 1.7 |
| Tigers | 1.7 |
| Marlins | 1.8 |
| Rays | 3.4 |
| Padres | 4.1 |
| Brewers | 5.9 |
| White Sox | 7 |
| Rangers | 7.7 |
| Giants | 8 |
| Reds | 8.8 |
| Dodgers | 10.5 |
| Yankees | 10.9 |
| Royals | 11.1 |
| Athletics | 14.3 |
| Cardinals | 21 |
| Mariners | 21.3 |
For all CF, the average UZR/150 is +0.3. Vernon Wells carries a z-score of -2.66; statistically he performs much worse than the average CF.
