That is DEFINITELY close enough not to veto. In fact, its pretty darn even. Why do you think Team A is not giving up enough? They are giving up Howard who is a first rounder, Beltre who is pretty much a wash with Delgado, and Weaver who is much better than a FA pitcher. Let's say that pitcher was someone like Marcum. The value difference between A-Rod and Howard is about the same as Weaver and Marcum, IMO. A trade has to be obviously lopsided to veto.
"The government cannot give to anyone anything that it does not first take from someone else"