From what I have read, it seems a 5 box team is able to solo all the heroic instances, but beyond that, they are stuck. Kara is 10m, Gruul is 25m and beyond is also out of reach.

Has anyone found a team willing to take 4 or 5 boxed chars with them to Kara or beyond? Will the lack of variety (4 shammy or 4 shammy and a prot pally) be a liability for the bigger raids?