2009 they were 7th in ERA (middling) made the Playoffs. 2010 they were 9th in ERA, but we all know the clusterf*** that season was.
2011 they also suffered several injuries. I am not using that as a copout (i mentioned other factors, like lack of discipline, for the decline), meaning this is a strawman (unsurprisingly).
There is no denying that injuries were a huge part of the problems for the 2011 Red Sox, but part of that problem is self-inflicted dut to their poor conditioning. However, things like counting Matsuzaka out (who could provide league average innings) and calling a middling pitching staff even with all the injuries "sucking" is hyperbole.