Blue
Ravenous Bugblatter Beast of Traal
The idea with a group check is that the people better at something help those who aren't. The rogue checking that the paladin's armor is covered by leaves when they set up an ambush, that sort of thing.Yeah, I don't know how almost half of your group can screw something up and still consider it a success. Especially with sneaking. But, you know, D&D...
So the mechanical result (>=half successes) means that the narrative result is everyone succeeds as a group. The sub-mechanical result (each individual check) are not part of the narrative in a screwed up/passed sort of way.