On the few occasions when I've been able to use group search, I've liked it. But it's INCREDIBLY annoying that it will ONLY find dungeons for your specific character level.
I wanted to find a group to do a dungeon. I had JUST leveled up. Now I can't pick that dungeon. All I can do is hope to group with people. Maybe send out zone requests and cross my fingers.
It really should just let me pick whatever dungeon I want. I missed a few lower level ones & now I can't find people to do them with me. It just really bites. It's a good tool, poorly executed.