Agree totally, its very important give positive feedback.
Had a particularly fantastic AF attendant on a flight from BCN to CDG last month, and she was about the only positive part of the AF experience on that occasion.
This may sound very "right on" but staff are any company's biggest asset. If they're treated as such it shows!
Unfortunately, the DUB CDG route is operated by a company called cityjet. Irish or Spanish crew, limited interest in customer service even for FTs.
Probably worse though, when the Irish crew make the safety announcements in French, or the spanish try either french or english, they're utterly unintelligable