Some times a GM doesn't get credit for NOT making trades. We don't know what was offered, or what Walt tried to get. I'd prefer he value or "over value" the prospect than throw them around like some GM's. Look at the prospects Walt has traded (I may be missing some):
Alonso
Grandal
Torreyes
Boxberger
Gregorious
Josh Roenicke
Zach Stewart
Tell me which of those guys you'd love to have back from those trades? I think he (and his staff) have valued the prospects well. Sure, I would have liked a move or two (still time to do so), but I'm not ripping him to shreds today. His FO is quiet even when a deal is brewing. How long did you hear about Latos rumors before he was traded? Maybe for literally 5 minutes.
I'm glad we held on to our top guys. The reviews on Stephenson and Winker have been so strong that I'd like to see what they can do here, unless we really get a great player in return. Let's face it, past them, our system isn't all that deep. I'll give you Lorenzen and Lively as the only other two players that a team would ask for in return. I'm a big fan of others in our system, but if you are an opposing team's GM, you probably aren't asking for Ervin, Waldrop, Kivel, or others in that category.