There has never been any UQ that, as a pug group, I failed in.
You're lucky. I've timed out more than once in a group full of mouthbreathers on SH Luther.
SH luther is broken, this is pretty well known. it has something like 3* the difficulty of XH luther for some reason... I've never failed any UQ and I've never done SH luther, only XH.
edit: scratch that, reading through the topic I forgot about one fight. Always have Gold Magatsu retreating because even though I tell people to aim for the weak spots (head shoulder knees abdomens only where the masks aren't broken) it fails every time , but there's still loot so.... :')