There have been many suggestions that heroes are too weak, too all-the-same, need to level-up faster, need more variety of special abilities, etc, etc. I started one thread on that general theme months ago in the beta days.
My point now is that there are also just too many of these wimpy, bland heroes. And if they address the above points, heroes as a group could actually be too strong. Currently people use heroes as scouts and cheap garrisons, but what if all those heroes were real super-heroes ? Yikes !
When/if heroes get, well, "heroic", then getting one should be a big deal. Maybe not as big as getting a dragon in Elemental, but still a much bigger deal than it is now.
And if they have time to get fancy, I'd still like some heroes to be much better than others, like "heroes" vs "champions" in MoM. Then "heroes" could still be a bit plentiful, but "champions" could be the rare big deal. I know they have some of that now with the sovereign's kids & grandkids, but so far my offspring mostly haven't been up to expectations.