There is an arbitrary fielding adjustment by position, so it certainly is possible that it's slightly skewed. But it's not as if those guys aren't near the top of the league in production.
Other top hitters not on that list: Ortiz 3.6 (DH), Gonzalez 4.8 (LF), Cuddyer 1.8 (RF), Goldschmidt 4.9 (1B) and Beltre 4.7 (3B).
I'm not yet a fan of WAR, mostly because of those position adjustments. I'm just not convinced that, for example, Ortiz loses that much value by playing DH. Someone has to bat in that spot in the lineup if you're in the AL, and the next best full-time DH in the league is Kendrys Morales. Nobody's even close to Ortiz's value at that position this year.
And the arguments against defensive metrics are well-documented. Cuddyer is getting killed, and there are a pile of RFs who rank higher than him, who, in my opinion, are clearly inferior.
Cuddyer 1.8 WAR
People are putting a lot of stock in a metric that rates Norichika Aoki (.281/.341/.362) ahead of Michael Cuddyer (.328/.392/.545). Not buying it.