1) Well in all honestly daily and weekly quests can get a bit old rather quickly. WoW introduced them to let its playerbase gather gold and farm reputation with factions. But doing the same thing everyday can get boring fast. Also every new patch in MMOs which had dailies contained new daily quests which got rather stale.
2) Depends on how they are implemented . The guild wars 2 system of dailies and monthlies wasnt too bad since you could complete them while doing day to day activities and not have to complete specific quests everyday like in wow . Dailies give a reason for people to log in once a day , like daily dungeon quests for example which reward a special type of currency or extra gold and give u a reason to run dungeons everyday.
3)If ESO can refine the system without making it tedious , i wouldnt mind. But if it forces us to do the same thing regularly, then I would vote no.
4) Yeah in a way , i have fond memories of running some reputation dailies with friends to get through the chore quickly and had some good times on Ventrillo while doing them. Problem in ESO though is the grouping system isnt done very well outside of instanced content.
5) I prefer Skooma.