It doesn't matter how loaded with scripture his book is. Satan can quote more scripture than you, me, and Paul Washer combined, and he can twist it far worse than we can. Washer has already twisted it badly enough.
It seems as though you are not willing to hold to sola scriptura. The scriptures and the gospel preached from the scriptures are sufficient to the saving of the world. Nothing Paul Washer writes will add one jot or tittle to the holy and inspired Word of God.
However, what Paul Washer writes can lead countless people into false salvation and despair, as he claims that we must keep up works after salvation in order to prove our salvation. Any experience of grace, something I'm sure most members of BB can point back to in their lives, is discounted by Washer as a silly profession, as he would rather people work their way into salvation rather than rely on the shed blood of Jesus and the grace of God that comes to us by faith.
As far as I'm concerned, Paul Washer ranks right up there with any other false teacher you want to trot out in front of us.