Aramis Ramirez probably is not the best player to be snubbed but the 3B going to the all star game instead are Placido Palanco and Chipper Jones. Chipper isn't even as good defensively anymore as A Ram. Palanco is understandable because of the fan vote, A Ram hit 10 HR in June/July so most votes were already cast.
Players picked Chipper probably because he's more likable.
If Reyes doesn't go, they already have Tulo and Castro, so they might go with A Ram as a replacement I guess instead of an SS. It's probably not likely, but at least there's a chance.