Those people have it backwards; Party Finder is for people who want experienced parties. DF is for random parties. You can't police a random system and expect it to pair you up with experienced and heavily geared players every single time. Especially for content that's still BRAND SPANKIN' NEW like Mog King and Ultima.

Pre-made if you want experienced. DF if you don't care who you party with. People need to learn it stop abusing others because they are too lazy to make a pre-made.