I like the difficulty of the boss mechanics, but I think their health/armor could be reduced so that the fights don't last 10 minutes. Mechanics and danger are fun, but doing the same thing over and over while slowly chipping away at a boss's health gets old after the first 2-3 minutes.

I'm level 25, I have all the maps unlocked and I'd love to continue doing the bosses while leveling. But they take so long that by the time I'm done with them I regret having gotten into the fight. On the other hand, grinding trash to level and quitting before boss just isn't fun for me. So I find myself setting the game aside even though the boss mechanics are great, because the fights are so long and require so many potions that they just become incredibly frustrating by the end.

Given that bosses scale with level (I assume?) and that we now have Elite bosses for the level-capped people, I don't see why the normal bosses should take so long to kill that they're just not even worth doing while leveling.