Look, what it really comes down to is this: fans find all the things wrong with the player who left, and play up the upside of the guy who just arrived.
Philly fans are stoked at getting a LB of the caliber of Spikes. They see the upside if he returns to form. They play up the fact that he improved as the year went on. At worst, they see themselves getting a good LB who brings a lot of fire to the table. They also see themselves getting a solid backup QB. And all they gave up was an average DT and a worthless 7th round pick.
On the flip side, we're stoked at getting a veteran DT who will fit our system perfectly, potentially fixing our defensive line problems and striking DT off the list of need positions in the draft. We love his sack stats and play up the positive reports we can find from people who have seen him play. We had to give up a great teammate but a guy who is really expensive and who has missed as much playing time as he's seen the last two years, appears to be a shell of his old self, and probably will never reach his old form. That and an expensive guy who will likely be their 3rd string QB -- big deal.
Who won this deal? Who got robbed?
Nobody did, certainly not yet. If Spikes returns to his Pro Bowl form, then the Eagles did well. If Walker solidifes our defensive line, then we did well. Holcomb is barely even part of the equation, to be honest.
But certainly nobody could honestly proclaim, with a straight face, that either team made out better than the other at this point in time.