Kinda hard to tell, I don't know where he started and how long he went.
And if you find the UZR appalling, you may want to look away for this. Hunter has career negative figures in: Total fielding runs above average, Total zone fielding runs above average, and negative since 2005 in Outfield arm runs above average.
I'm not disagreeing with you that Hunter is a good fielder--I think he is. But I don't think Hunter's negative figure is a reason that UZR is a bad stat.