Sure, it's most likely unfair as I know nothing about them. Maybe I'll check out their screenshots eventually, but what they're doing is already illegal: creating a game for a console without permission for one, and using artwork without permission (even if just in mockups) for two. At least JForce isn't doing anything illegitimate, even though they're arrogant and annoying.

And saying, basically, 'the fact that the part they made in their game about JForce looks horrible proves their engine is powerful' is kind of bizarre. That game about JForce could have been made in Game Maker or RPG Maker in 5 minutes (in fact I thought it was RPG Maker when I first saw it), it doesn't really show off anything powerful to me.

I have no idea about Gyrovorbis and never heard of them until JForce mentioned them in their video, so for all I know their game could turn out to be great, it's just that their video makes them seem just as arrogant and inexperienced as JForce is; they aren't giving a good impression of themselves through it. But that's fine, they don't have to, maybe investigating them further would show otherwise, but I can only go based on what evidence I've seen.