Salmons can serve as Toronto's version of Tayshaun Prince: about as good, but much, much cheaper.
And John Salmons hasn't been very productive over the last several years of his career, but then again, neither has Gay. Patrick Patterson is young and has shown some signs of being a decent player, but as a power forward, he probably won't see too much playing time. This definitely helps, as any time you upgrade your overall productivity, you win the trade, but neither player is likely to be a major win producer. Vasquez and Hayes both offer average production at the two most important positions.
As for the players the Raps are getting back, they turned Rudy Gay into two solid - but not great - players.