According to ESPN draft results, Lowell goes 49th and Walker goes 129th. Huff goes 55th and Young goes 144th.
Looks like a fairly even trade to me. If anything, the guy getting Lowell and Walker is the winner of the deal.
Your trade however, has Vlad (#4) being traded for Wells (#33) and Contreras (#142). This is a classic 2 for 1 trade - one good player plus one decent player for a great player. Ask 10 people here at the cafe which side wins and 9 out of 10 will say the side getting Vlad.
"And so he spoke, and so he spoke, that lord of Castamere. But now the rains weep o'er his hall, with no one there to hear." - The Rains of Castamere