The Angels are vulnerable?

Saw an article on ESPN by Jayson Stark. In it he talks about the A’s additions this off season (pretty much Giambi & Matt Holliday). It should definitely help their offense.
However, the teaser for this article on the ESPN site has this text:

The A’s added both Jason Giambi and Matt Holliday, hoping to not only improve an offense that was 27th in runs but also close the gap on the vulnerable Angels in the AL West.

Vulnerable? The loss of Frankie Rodriguez is a big one for sure, but I don’t see them as “vulnerable”. Do you?