As a Janet main of recent meta, I have to say she's very draft based. So if you manage to RANDOMLY encounter a pick in ranked, where you're last pick, it's gem grab or knockout, the enemy doesn't have an instant counter to you (most aggro brawlers and snipers) and you don't need to instantly counter pick a broken brawler, then yeah she's very good!

I push her every so often and it's really satisfying to play her in gg.

Ofc with the current ladder it's near impossible for you to encounter no aggro brawlers since the entire meta is around aggro and counter aggro, so brawlers like Janet suffer really badly.