While I may be overstating it for some, I do not think many here think Marco is worthless. In fact, I'll bet several here think Marco should be able to pitch at the MLB level for at least 5 years, and probably longer...... IF and when he is healthy. That said, IF Marco stays healthy, there is a 50/50 that the M's actually end up with getting the better end of this deal here.
As you so aptly put though, as well as others before you, Tank was worth more to the M's in a different deal rather than this one... a deal that actually excited the guys in the locker room, and that led to a 10 game winning streak. One would think that as an ex-player, Dipoto would understand the difference... unless Dipoto has other moves up his sleeve that Marco is a part of... then Dipoto will have surprised all of us once again.
Go ahead Jerry... I dare you to surprise us now!!!