such guys are just too bad for PvE. Therefore they search for good/over geared people who carry them through the content. I don't know if this is from US or EU but both armory profiles indicate that my assumption is true. If it is US it is a 510 geared priest who does not even fulfill his own requirements or it is a 547 paladin who did not even set foot into normal raiding and most of his gear is from the treasure chests on timeless isle which isn't very promissing either.
Just ignore such guys and if you can't find a serious flex group just create one yourself. Ilvl 515+ seems to do the trick for at least the first 2 parts.