When people say there's nothing to do, they are referring to nothing that holds their interests. People shouldn't be forced to go into a fairly niche section of the game just to get what little scraps of content there is.

The developers should be doing a much better job, and no amount of "Go do all those Big Fish", and "Haven't you thought about doing Frontlines until you feel like crying for the several thousand victories achievement" is going to resolve the serious content deficit.

It's an utter sad state of affairs when the suggestions amount to "Go do content from 3 expansions ago". We have been doing this already for long enough.