If its not enjoyable, then don't play it? While I do sympathize with you not being able to get your refund, publicly bashing the game because of its difficulty is childish, because that's what this thread boils down to. It's equivalent to CoD removing it's "aim-assist", it makes the game harder, but doesn't actually change the substance of the game at all. The story is the same, the game-play is the same, the features are the same. It's just harder.
As for the people with disabilities who actually have legitimate concerns, I'm fairly certain attacking is still mouse-directional/movement directional just like blocking. So if their disabilities affect them so badly that they can't block, how can they attack? The AI's sword blocking is nearly perfect, and don't get me started on trying to get past an AI's shield. They'd need auto-attack or aim-assist to compensate. Melee combat itself is non-playable for them, riding horses and using lances requires more multitasking and reflexes than blocking. For people with disabilities there has to be more than just auto-block, to make the game enjoyable (by your logic). They'd need auto-block, auto-aim, auto-move. I'm all for accommodating the disabled and would love to see this implemented for the disabled who truly need it to enjoy the game.