I sorta have mixed emotions about the dungeon finder system from WoW.
IN that game outside guilds... good luck getting a party for anything people actually put others down for grouping. When dungeon finder came out it made it possible for people who like mmos to play it like a mmo more or less.
ATM ffxiv is the same way, people outside the guild(ls) simply refuse to party... which I will argue to the death is a community issue not a game issue. Considering all the elements are in the game to make partys and they even give a massive bonus for doing it. IN FFXI people from all over the world partied almost the whole time they played, in XIV no one does... so can't say anything beside the community needs to figure it out.
A Wow Dungeon finder system would make grouping easier, but it hurts the server community, and allows for alot of griefing. Especially with the current lotting system, I just do not see how it would work at all. That combined with the fact all the instant/raid like in ffxi gave no sp/xp so if it is like that on ffxiv (yet to be seen) the whole dungeon finder thing to group up would only be for loot so it would not encourage the right community anyways.
I would rather see something change where people group up in on the servers all the time. you know have 2-10 partys in the search thing every time. Log on and simply go to search join a party and do leves or normal sp partys. This sounds impossible but think about it.. if everyone who wanted to make a party used recruit and everyone who wanted to party used search the system would work perfectly. Only doesn't work before people gave up on it because it is "Too Hard and Broken"... i question how some people graduated highschool with those comments, thing is pretty basic to figure out.
Grouping is the main problem with the fun factor in this game atm, at least for me. But dungeon finder I just don't see as a good fix. I think it will bring more problems then it is worth.