Basically, this. We lost our Ace so we've had to depend on a head-case like WIlson, who can barely make it to the 6th, a couple of WHIP destroyers like Blanton and Vargas, a decent 4 starter in Hanson, and a AAA project in Richards. Add to that a BP who hasn't seen solid contributions from Jepsen, Madson, and Burnett, a declining Downs, an inconsistent Frieri, and a cast of characters that make you long for the days of Jason Bulger and Bobby Cassevaugh, and this team is going to struggle to prevent runs.
As for the offense, Hamilton has been the invisible man, Pujols is injured, Trout is trying to make adjustments, Ianetta has been "meh, and Kendrick waffles from All-Star to bench player, sometimes within the same game.
I'm not a huge Scioscia fan but it's hard to rationalize the grip of injuries being his fault. Also, I don't know how he can be held responsible for the team's awful AVG with RISP. Perhaps it's DiPoto's fault for assembling this team and leaving the high minors and bench devoid of talent.