Like everyone else, I prefer to have the inflight crew seem like they take an interest in their job. Smiles, yes. Bored faces, no.
I look at the service as the interaction between cabin crew and passenger.
Helpful, freindly and available. The thing that IRKS me the most are the disappearing F/A's. We've all seen it. They drop your meals on your tray table and then disappear for most of the flight, only to reappear to pick up the trays for landing. If you need a second cup of coffee, the answer will be "Sorry sir, we are too close to landing for that". Where have YOU been for the last 3 hours so I could ask for it earlier?
Like an earlier post said, you can have great service on a flight that offers only beverage service, it's all about how it's played out along the way.