Sorry X, not to be offensive but I'm calling you out on that. The first Girahim encounter is the most difficult for a few reasons. Firstly if you've never played the game before it takes getting used to, second you have the least amount of hearts and finally the blocks are there so the player has to attack a certain way to counter, it's not a block that you can't punish. If you attack right you create chain attacks and kill him in no time. As the player progresses through the game the encounters get easier due to more hearts, more mastery and the fact the player improves.
While I've heard about technical issues due to certain wiimote plus controllers I've never read complaints pertaining specifically to Girahim, not that I'm claiming they're non existent. I've known people who claimed the wmplus wasn't that great but they still managed to finish the game without too many issues.
I'm curious as to how long you both played for, you mention you tried as well and it was after 30 minutes. My memory is vague about the timeframe but I would say the fight itself took around 15 and probably took me a few goes to suss out what to do. I may have spent an hour fighting this boss and in my opinion it was a big part of the learning curve that set up the rest of the game. That's my two cents.
If they don't include specifically wmplus controls so be it, but enemies better have techniques and methods to guard against regular attacks.