I got a banana AND a candy bar when I flew first class with delta. I like delta service and glad that was a free upgrade because I would've been ticked if I'd payed extra for that! I suggest buying something after you've gone through security!
Definitely true -- where were you flying out of? you can expect vastly different service based on where you're flying out of and where you're going. Add your complaint to http://www.ihearditsucks.com -- They aggregate content on complaints and contact the company directly.