Actually I think this is great for parties. It doesn't really rely on sound at all. For the players involved, the gameplay relies the most on the haptic feedback from the joycons. For the illusion of the thing, I think people are going to be making the sounds themselves. Like "BANG!" when they draw, sick milk sounds, etc.
This is very much a party game for young adults who are just hanging out and don't really want to play serious games. It's a distraction, not the main attraction. The main attraction is the company, the minigames are just an outlet.
The problem with this being a 50 buck product though, is that for someone considering picking this up for that purpose, it's a 350 buck investment, not a 300 buck investment. For someone who is interested in getting more games, it just adds up. As a pack-in, it would have made the Switch itself a more attractive pick up since for 300 you can get the device for what you want it for, and you MIGHT buy other games too.