Drinks at the Deck are self-served. I would not be expecting lounge staff to wander around the Deck to fill up my glass with that bottle of Mumm which is otherwise sitting in the fridge next to the noodle bar.

There is a smaller selection of food compared to the other lounges due to the limited serving area. I would not go to the Deck and expect a big buffet - the same way I would avoid the Bridge for Chinese noodles nor the Wing for peace + quiet.

Btw if you're in that corner of the airport and have access, the QF lounge next door features a larger selection of food options and more interesting still wines.