Was it paid F or an upgrade? If paid F I would definitely ask for a voucher (maybe $50 Delta dollars?) in the complaint since dinner was part of the experience you paid for. If an upgrade I wouldn't ask for anything specific in the complaint and just hope for a few miles.
I am never bothered when they run out of my first choice since I'll eat pretty much anything put in front of me, but if I was counting on a meal and there was nothing available, that would be annoying and definitely grounds for a complaint.