I think there are several ways to implement dailies that would work for people. I think they can be healthy for a Sandbox MMO to have something predetermined to do, kinda like stretching your legs before a big run....
I think tying them into the over all game play is a must, if you are in a town, or own a house a simple task to help maintain maintenance make more sense to me then just kill 10 of X.
The rewards for dailies should be something worth gaining, but yet not a deal breaker for the few who prefer not to partake. Maybe its a simple way to get some gold, or a single random rare resource.
I enjoy daily's that have some randomness to it.. 1 of 10-20 possible tasks that rotate around i think adds to the fun of doing them..
I think if you tie them to a streak system.. like do 30 dailies in a month and get X can be dangerous... no one likes a game that they feel like they HAVE to log into... but at the same time... the idea of the dailies building for something bigger can be part of the fun... so if Fratured goes down that path, I think they should avoid the time constraint and just maybe have 30 dailies give you X.. do them in what ever time you can/want.