What would have been really nice would have been to see Vunivalu against the Chiefs backline to find out if he's ever going to be any good. Based on all the evidence to date you would think that his hamstrings won't stand up to this class of rugby and he needs to retire permanently.
Nah, this is a poor take.
Not sure why you're still waiting "to find out if he's ever going to be any good" - pretty sure his ability has been well and truly established. Vunivalu's last outing against the Chiefs: 58min, 1 try, 10 runs for 82m, 4 clean breaks, 3 defenders beaten.
Injuries happen in professional sport, it's the nature of the beast. Maybe he is more prone to them, maybe they haven't been managed properly to this point so keep recurring, maybe it's just bad luck - who knows. What is certain is that he's a player that makes an impact.