This is a very old (1992) article from John Piper - you can either follow the link or read it below.
Note what Piper does, here. The balance is instructive. The first paragraph lays out the blessing Stott has been to the church, and ends 'I love John Stott and thank God for his ministry.' In fact, even earlier, the piece is entitled 'When a FRIEND takes a wrong turn' (emphasis mine).
Then, immediately, in the second paragraph he pulls no punches: Stott's unorthodox line on hell is called an 'abandonment of the historic biblical truth' and 'a tragic defection from historic orthodoxy by one who has championed 'Basic Christianity' so faithfully'.
Subsequent paragraphs attempt (I think successfully) to show what violence Stott must do to clear Biblical statements in order to maintain an annihilationist position. And after a call to pray that other evangelical leaders won't go the same way, Piper signs off with 'soberly' - it's a big issue, it's an issue that's made him grieve.
I do believe this is one of the areas (others include, for example, ecumenism) where John Stott has done the church a great disservice, making respectable - in some quarters at least - what has hitherto always been regarded as a dangerous departure. If the final fate of the lost is unconscious non-existence, then Jesus died in vain and the Father is a monster - giving his only Son to such agony to save the world from something they would never know about, never feel, never experience.
But I recoil (now - I did not always) from that attitude which says that therefore Stott is some kind of theological leper. He's a good man, a gift to the church - and a flawed man whose statements need to be weighed and sifted. And that, of course, is true of everyone.
May God give us Piper's grace, and Piper's discernment. And may the same God bless and draw near to John Stott in these days when age and ill-health are taking their toll.