Just be happy you didn't get Frank.
I don't think all bosses need to be equally hard. They will vary in difficulty for different classes, so they are pretty much impossible to balance anyway. Random bosses being randomly more or less difficult is fine IMO. You can always use scout boss to find out early which one you got, then pick your god and glyphs accordingly. Or just don't use preparations and leave the dungeon for some extra cash if you cant win.
Why do people suddenly expect to be able to win every time? This hasn't been a problem in the alpha. DD is a hard game with random dungeons, which means sometimes you are unlucky and cant win. On a normal map this happens very very rarely for good players, while on challenge maps even good players often need some luck. IMO this is fine. You cant make a hard random game that doesn't sometimes just screw you.