Haven't worked in despatch for a few years but when I did.........
Contrary to whats gone before
Best - UK carriers(mostly), Aviaco, Spantax (yeah I know, that dates me!), JAT, EI, Inex Adria, Aviogenex. All these usually offered drinks and demonstrated a relaxed approach.
Worst (for reasons including awkwardness, pedantics but not I stress competency) CY, Balkan, NLM/KLM, LH. In most cases these guys were formal and distant.
Spent 6 years doing the job and only came accross crew that gave me concern on 2 occasions. As has been said before, its a bit unfair lumping all the crew together in this way as many bucked the trend both ways!