I've played Reginleiv, and I can attest to it being a pile of shit. It's an absolute mess in terms of tech, and I don't mean in "GAF terms" if that's your concern. The game slows down to a crawl in pretty much any battle. Not just to ~20 fps, it really feels like playing a slideshow. The combat isn't that great either. The motion controls actually work quite well, but goddamn is everything else handled poorly. The "draw to slash" sword fighting is slow and awkward, and it makes aiming your slashes (which is core to the combat) difficult since all the action is chugging along as it happens. Ranged combat and magic are handled in weird ways too. That, plus the framerate, pretty much make any combat situation unplayable. The game has a few redeeming qualities and is occasionally even a bit fun, but the vast majority of the time it is boring, bland and extremely slow. I won't get into all the other technical problems (crashing, some stunningly awful animation, ugly generic visuals to name a few) because the game is that problem alone is so game breaking I'm surprised anyone, much less Nintendo, ended up publishing it in this state.
I'll admit that the game has a few interesting touches, but anyone who genuinely likes this game is able to wade through a lot to get to that occasional nugget of amusement. I'm a pretty forgiving guy when it comes to games and I've liked most of the Wii games that got on GAF's hate list, but this game is fundamentally broken. This isn't some anti-Nintendo scheme or some BS like that, this is a genuinely bad game. I don't like to bash it because I know the niche appeal is enough to give it a few fans, and I don't want to be the troll even when the game deserves it. I've been seeing a lot of paranoia about bias when it comes to these games, and it's completely fucking unwarranted. Disregarding my own opinion (which actually is not that bad, though I couldn't stand it longer than I felt was enough to judge the game), the game has way too many issues to be tolerable to anyone but a few batshit crazies and Australians who bothered importing it. It's kinda like didgeridoos. There's no credibility for the idea that this game was good or really worth releasing, and this idea of Nintendo haters conspiring to smear their names is fucking absurd.