I see one and only one reason to use the Content Finder (it's real name here) - if you're bored or have time for just one quick run of something, and nobody you know is on. It's a nice way of jumping into a group fast so that you're not doing nothing.

Personally, I won't have much use for it. with 8-man content its not hard to fill most spots with people in linkshells and on friend lists, and you can be certain of the quality of players rather than hoping you're not teamed up with 7 morons.

Even if the group I form is 6/8 or 7/8, I'd rather shout for the last spot. There's plenty of people I've done stuff with that I'm not in the same ls as or they're not on my friend list. If I see a tell from someone I know is decent I'm happier with that than playing dungeon roulette. I've had no issues finding a last 1 or 2 people for a run with a moderate level of intelligence in under 10 minutes. In fact, this is how I've made most of my connections in game. Perhaps the content finder would be more useful if it were a more useable version of the party recruitment feature (actually working, people apply to join your party you're recruiting for, you set a start time and select from your applicants). A truly random system that slaps a party together is going to be as underused as /search is now. If players have some control over it, I think that would end up being better.