I think it would be fun if there were a wider variety of FATEs. For example, if certain FATEs only spawned for during certain weather.

I think it would also be fun if there were more incentives to do them, other than minions and exp. Like if mobs had a chance to dropped special items or mats (only available in FATEs). Might make things a bit more interesting. It would work for potential gathering FATEs too.

In any case, there really needs to be a better reason to do FATEs other than the exp. I personally like the little intro story that goes a long with it, but I know not everyone finds that kind of thing interesting. A FATE journal, to keep track of the ones you've participated in, would be interesting too.