Not considering many Eastern European carriers, I thought El Al was pretty bad, but then again, after visiting Israel, I'd have to say it's a cultural thing more than anything else.
Domestically, the best FAs have been on B6 and WN. I've also had a good exp'ce with UA yesterday on KOA-SFO (maybe it's the hawaii-based FAs?) US FAs are generally indifferent and so are most DL and CO IMO. NW is the worst of the bunch, but I've never had what I would consider a rude FA. An indifferent one - yes, but a rude one - no.