personaly, sure, wow got easier and alot more fun with the LFG tool, suddenly, you could keep leveling and still have your random instance att a moments notice.
the downside too it was that when they made it cross server, gawd it was SO EASY getting a group, was the group fun? no, nobody said **** and you couldnt really get to know the players, was it easy? no, mostly you got players that barely knew how to play and then blamed it on the tank or healer. was it good? after a couple of hundreds of lfg's with dps speced tanks/healers you got kinda irritated att it..
sure, the pro's to LFG tools are easy acces to the FP (you dont even need to know were it is anymore!) and you get a group fairly quick.
The con's to it is that well, as per standard, you dont really know what kind of group your gona get, you never get to know the people in the group, most people who do it barely even chat and they also tend to be anti-social and insulting.
Personaly, im against a LFG tool (the one thats already implemented is good enough.)
My experience is that when a lfg tool comes, it tends to kill of a good bit of the social part in a mmo, sure, you wont have to suffer the people who /1 lfg but comeon, the /1 lfg comments usualy start conversations in the /1 that can be pretty hilarius.