Yoshi P said himself at one of the fanfest panels that one of the challenges in doing endgame raids is putting together a team that can work together. Thus those raids drop better loot then 4 mans which they don't want to be harder.

If you want to do the hardest content in a MMO you will have to put a team together there really isn't much way around this. If not then you can do the easier content or wait until the nerf/echo come into play. Don't expect to beat the hardest content in any mmo with just randoms, game designers don't do this because then the game is way too easy for the organized group.