Lowdrop rate - it annoys me, esp when I keep killing and killing and I usually give up when I couldn't get it.
Travelling - I'll only take them, if I do plan to open a flightpoint, or tey are dungeon related with HUGE exp, otherwise, NO
Killing - I LOVE killing quest. Just kill and hand in, easy.
Messenger - only if they are within area, otherwise, the items just sit in my bag doing nothing until I chuck them out when I out level the quest.
Group - I can easily pester a friend/guildie to do it for me
Escort - Surpirse it ain't in the poll. I'll accept them ONLY if it rewards a real upgrade or it's a start to a really good chain. I usually only try them once, then 'nah'.....I hate how those npc's walk so slow