Perception, as usual, clouds everybody's judgement. Lets take the great Reggie Wayne, who is considered a far superior WR than Stallworth, both in durability and ability. However, comparing the first five seasons (which is a huge metric), you might be surprised to see they are very close (even with all of Stallworth's injuies, he has still managed to keep close to the great Wayne).
Stallworth - 233 receptions for 3516 yards and 28 TDs
Wayne - 304 receptions for 3956 yards and 28TDs
Now the huge stat of the day:
Wayne has started 20 more games than Stallworth
Wayne has had Manning throwing him the rock, Stallworth has had Brooks (who a lot of you pundits say is terrible, and for a half season, McNabb and Garcia).
So the bottom line is, with all our speculation, there really isn't a way for us to determine Stallworth's value this season. We can assume he'll put up his average numbers, but he does now have a very good QB in Brady, and the fact that he is the best WR on the team, we have to assume he'll better his numbers (if only slightly). 80 receptions for 1100 yards and 8 TDs is certainly do-able. His injury history is a concern, but just as in roulette, just because it has hit red 18 times in a row does not mean that it's got to hit black anytime soon (the odds are still 50/50). The probability of Stallworth getting injured is just as likely (or unlikely) as Wayne.
Lastly, it's funny to read how most Philly fans wanted the guy back, but most NE fans aren't too happy to have him. Consider with all the turmoil they went through with TO, for Philly fans to embrace another WR should give credit to Stallworth as a player.
And finally, NE fans - get over yourselves.