Denying the Sunnah of Rasool SAWS means the 'Global wrong path'. The path of false Prophet Rashad Khalifa who divided Muslims by rejecting the Sunnah and Hadiths-Gospel of Rasool SAWS, but not Islam.
Although, the worst done by the fake Imam Agakhan an atheist who rejected Islam, Allah, Quran and Rasool SAWS. He eliminated all for his followers.
No doubt there are some weak Hadiths but it doesn't mean we are not capable of recognizing weak from authentic. Like aren't we intelligent enough to recognize the true GOD -Creator Allah from the false gods - and their Statues.
Why do some Muslims argue and reject the Sunnah and the final order of Rasool SAWS: "Follow the Quran and my Sunnah".
Even in the Quran Allah has reminded us to follow him-his ways.
Of course his ways were according to the Quran, but what he did, how he behaved with others, how he prayed how he fasted - these are the practical actions we are suppose to follow.
Quran doesn't say how to perform Salat, but we follow Sunnah and know how.
In every academic education we have Theory and practical work.
Similarly in Islam we have theory and practical-Quran and Sunnah-tradition..
Most amazingly, some non-Muslims have written books about Rasool SAWS "Chosen Best one out of 100", describing his perfect characters, honesty, patience, and his dealing with people.
They knew it by reading his Hadiths books written by his faithful followers and not by the hypocrites and fake Muslims who rejects his Sunnah and Hadiths.
Just think how the people of the book are following Hadiths-Gospel of Messiah Jesus (AS) combined in the Bible.
Think hard like true Muslim and you will get the right answer.