Last fall I've got tickets on SAS (4 sectors) and one of the sectors been operated by Maersk (Denmark), and I eventually discovered that I need to pay for food and drinks on this flight. Considering that I've paid too much for such kind of flight (SAS is still one of the most expensive European carriers) I wrote a complain to SAS, pointing that full service reputable carrier like SAS should ensure that codeshare partners are providing the similar standart service before putting any codeshares on them. Two days later I've got feedback by e-mail from their customer relations dept, who was appologizing for inconvinience, assuring that my point will be taken to customer service board meeting and also I've been given SAS vouchers (worth EUR 100).
I believe that's a proper reaction from airline and my money are still with them (flown them 5 roundtrips since then).