I like the trade. I realize it could end up being a bagwell trade, but it could end up looking like a great trade for us or anywhere in between.
If Pomeranz gives us 2 and a half good years, considering the strong nucleus of hitters we have for those years, the only way I would consider it a bad trade is if Espinoza turns out to be a truly elite pitcher. It's hard to find a good comparison for Espinoza, but I found 4 who started in the minors at age 17 or 18 and became elite pitchers, Felix Hernandez, Clayton Kershaw, Dwight Gooden and Pedro Martinez. None of these guys struggled like Espinoza has when they were 18/19 and playing A-AA ball. Granted these are some of the best pitchers over the last 30 years, but if anyone can find a pitcher who struggled at 18 in the minors and turned out to be great I'd love to see it.
On the other hand there's a chance Pomeranz falls apart or can't handle the AL east, but I think this trade could help our WS chances for more than just this year.