I agree with the sentiment that the big bat is what this lineup lacks. Sure, Bay hit for power, but he wasn't what Manny or Papi was to this team in years past. We need someone who scares the crap out of other pitchers and makes teams pitch the entire lineup differently.
Pitching wasn't a problem. Lester and Beckett weren't great, but they certainly weren't bad. What's more, they're capable of being dominant. Combine that with Buc, Dice-K (who I believe will bounce back and at least be as good as he was two years ago), and Wake and the rotation is fine. While another ace wouldn't hurt, it also wouldn't solve what happened this past series.