This will go as well as all the "Group Discussions" that many companies conduct go (aka not well). You are expected to treat other interview candidates as your

This will go as well as all the "Group Discussions" that many companies conduct go (aka not well). You are expected to treat other interview candidates as your friends and peers while you all know you are competing with each other. But you can't show that, so you resort to fake over-niceties and all to look friendly and sociable. At the same time, everyone feels pressure to prove themselves over the others, so they will want to say something so that they appear intelligent and don't get lost in the background. Not everyone can do it equally well, so the more extroverted types will dominate and make the others feel like shit.