I work as crew as BA, but I travel on them as a passenger about 8 times a year to get back home, and I have to say that our trouble is consistency.
Sometimes the crew are great, but other times they are embarrassingly rude and I just think to myself if only they knew I was crew, or thank god I'm not paying full fare for this!!!
I think our product is very good. Even in traveller the dinner is always nice, club is fantastic, and first just blew my mind, but down the back of our jumbo jets it's incredibly uncomftable, but I guess that's the same with any airline and on a long sector like LHR-SIN for example if the crew are average and you're uncomftable it just makes everything seem even worse!
I think on general though our crew do pull their weight, but we're not all angels I'm afraid.