So today i joined a group that is half-way through Darkshade Caverns 2. For some reason they were stuck at the huge Netch. Not just me, but another two people joined at the same time. So 3 of us didn't do the Hive Lord boss. We made it through the Netch, the dwarven army, and slayed the Engine Guardian finally. Now three of us didn't finish the pledge because the progress won't transfer to pick-up group members. We had to do it again on normal (and guess what, on normal it's even more difficult because most noob healers don't know to use healing springs on last boss).

I think this is a poor design, since this discourages joining a group that meets trouble and needs help. You should encourage the players to offer a helping hand by transfering the pledge progress completely.

On the other hand, if you queue for a random daily and joined a group at last boss, you still get the full credit. This kind of inconsistency in game design is really bad.