the fotm build leans tanky, that is pretty much how all the pros have been building him
oh unless we are talking about like ryan choi making rengar popular a few patches ago, which is not what im talking about, I'm just talking about the surge of rengar in competitive and the resultant copying
bad mechanics is worse on something like lee, rengar literally just has to decide what order of spells he wants
jumping in at a bad time is bad decision making, but like i said there aren't too many jungle champions you will successful with if you are diving in on bad situations with the full vision rengar ult gives you
like yeah i feel your pain playing with bad rengars, but it really isn't the champ's fault
rengar got good in the jungle because of ryan choi actually, i think it's because of him that they made his ult give stacks after reveal