She has like a 36.7% WR going for her I think rn? My impression is that she is trying to do warwick but is too squishy to do warwick, which makes her very easily duelable in the jungle with a lethality build and a healstopper (I play Poppy)
I think she's bad for a lot of the same reasons that Troll Warlord was the worst hero in Dota for a long time - your spells force you to int and remove control of your hero in crucial moments. At least Troll's inting ult also has the tryndamere death-stalling effect - Briar just taunts herself and dies.
This is a solid take for players who haven't played dota. I didn't make the connection but she's so much like troll that it's crazy. That said, she seems to have a better time in top lane than jungle depending on matchups. She embarrasses most ranged top laners too.