i think one of the goals of the whole expansion was to try and put an emphasis on tight-knight groups (guilds) and what not to do the content with. ie, building a 'team' more than randomly pugging all the time. its a bit sad for the solo player, but part of the fabric of a game like this is coming together on some level with other people, since it is a 'massively multi-player' game
in any case the heroics are well tuned imo. they're only hard when a) no one knows the mechanics of a fight or b) no one knows how to work together. god save you if both A and B are true