The Good: Well-rounded offense, not reliant on home runs or scratch runs
The Bad: Kimbrel. There's a volume of history that includes Foulke, Uehara and Papelbon being critical to playoff victories, but a guy who yanks balls 4 feet to the left every 3 pitches doesn't provide that confidence. (Remember what it was like to know that, no matter what, Koji was never going to walk a guy in the ninth?)
The Ugly: Along that same vein, the bullpen. Yes, they've been pitching better, probably as a function of starters going longer. Still, there's not a ton of confidence in locking down the final 3 innings for this team...and long relief is league average, at best. For the Red Sox to advance far - Robbie Ross, Brad Ziegler and Kimbrel need to be light's out, otherwise the team is too much like the former Tigers. Wouldn't it be something of Koji and Tazawa came on...
But all in all, this offense (and fielding) can cover a lot of weaknesses - mostly because it's so multi-dimensional. Cold weather and ace pitching is not going to dry up run scoring like it will with some other teams.