Did you play it pre nerf? That was the worst area in the game for pure melee users.
I have not.
That said, I think From has tried to prod players into being more varied in their tactics this time around in Dark Souls 2, with the increased ring slots and encumberance changes. The Shrine of Amana is certainly a late-game area, and I would personally expect most players to have an expanded arsenal by that point in the game.
It is easy to start Dark Souls 2 as a melee fighter, but with the very nature of diminishing returns for your stats it should be expected to "multi-class" into another role, either a ranger or a spellcaster. If you double-down on melee fighting, then you should have the equipment and tactics to survive the Shrine with ease - so long as you prep yourself accordingly (such as using a magic-resistant shield).
In short, being a difficult part of the game does not automatically make it unfairly, lazily, or badly designed.
Like the rest of the game, the Shrine of Amana is a test of adaptability, cunning, and knowledge.