I don't think the pen should have been a surprise. We added Jansen, Martin, Joely and Houck was supposed to be in the pen. Yes, Wink and Crawford have been surprises out of the pen, but overall, I'm not surprised.
What I'm most surprised about is just how badly our rotation has done. I knew it was a problem area, but I don't even think the 9 posters who predicted losing records thought we'd have a SP'er ERA of 5.55. Virtually every SP'er has underperformed projections by every projection service. Doesn't that more than the offset the "surprise" 30 games from Duran & 8 games from Duvall?
To me, Casas has done worse than I expected.
We have certainly gotten production from players I never expected, but I don't think posters fully appreciated the depth our roster had. They only looked at the losses at the top of the roster and who we replaced them with and underestimated that replacing the big 3 (Bogey, JD & Nate) with 6+ lesser but still very good players (Yoshida, Turner, Duvall, Jansen, Martin and Kluber- not so good, so far.)
We've had a lot of our better players out with injury, too- more than I expected beyond Story.
I expected Mondesi back, alreay.
Paxton took longer.
Whitlock, Crawford, Martin, Schreiber and others missed some time.
Arroyo & Chang put a strain on middle IF depth.
Duvall was off to a great start, then...
All-in-all, I think the surprises have evened out: good vs bad.