Why Did Josh Beckett Become Derek Lowe?

I guess if he turns it on in the post season, and helps the Sox win their first World Series since 1918, it's ok, but am I the only one who thought we were getting someone more akin to Roger Clemens? Isn't having an 11-5 record, but an ERA above 5.00 kind of like being president but your VP and staff are doing all the work?