Skullcrusher EU
ICC10 - most PUGs will do 6/12 as standard. Slightly better and more co-ordinated ones will manage Putricide and VDW. If a PUG kills BP and BQ then you've gotten yourself a pretty nice run. Never killed Sindragosa without being in a semiguildrun and killing Lich King is unheard of.
25 man is much more boring, most will kill Saurfang or wipe on Marrowgar due to not meeting the high (by comparison) tank healing requirements. Any PUG which kills festergut or rotface is very rare.