Verlander had 4.9 Win Probability Added in 2011, a great total. Over the last 3 years, only 3 AL pitchers have racked up more WPA, but one of them was Jered Weaver in 2011, who had 5.2:
Verlander edged Weaver in ERA, 2.40 to 2.41. However, most folks these days put more emphasis on runs allowed, as opposed to earned runs. Weaver allowed just 2 unearned runs; Verlander allowed 6.
Weaver's actual W-L record was 18-8. Verlander's was 24-5 but his neutralized record was 18-8, the same as Weaver's actual record.
Verlander had great run support:
|0-2 Runs Scored||6|
|3-5 Runs Scored||17|
|6+ Runs Scored||11|
Weaver had much worse support:
|0-2 Runs Scored||13|
|3-5 Runs Scored||16|
|6+ Runs Scored||4|
Verlander had the benefit of a better bullpen behind him, including Jose Valverde, Joaquin Benoit, and Al Alburquerque. Weaver had a weaker bullpen, with a worse closer in Jordan Walden, and only Scott Downs putting together a really good year.
Now, these arguments are pretty much all I can find in favor of Weaver. In pretty much everything else, Verlander blows him (and everyone else) away.