Upcoming Assassin Update and Game Health
The previous class update, the Mage update, was an absolute joke in terms of game health. Malzahar, Vlad, and Swain were basically buffed while their game health concerns of being oppressive were untouched. This update was such a joke in this regard, that Riot made the rare step of admitting the mistake recently.
> "We also think we should have done less mages in retrospect but pushed the ones we did push further. Malzahar could have used even more work on the game health side..."
If the Mage reworks were such a laughing stock in this regard, why should we have any faith the Assassin rework will be any better. Looking at Riot's track record on class updates on outdated, oppressive, unfair champions; we'll get an Assassin meta and every Assassin will be buffed.
If you think Rengar is unpleasant now, wait for the Assassin update.