What is your opinion on Slytherin
Personally I agree with clip, the hat may decide your house, but you decide if you've earned it. Peter earned his way into Gryffindor, and he was loyal to the Potters, the way he dies by his silver hand strangling him to death proves that he was not 100% loyal to Voldemort. If he was, the hand would not have strangled him. Very few times has the hat ever been wrong about where a student belongs, the hat even says "I stand by what I said last year, you would have done well in Slytherin." when Harry thinks he is the Heir of Slytherin and is visiting Dumbledore's office. But the hat was wrong, because if Harry did belong in Slytherin, he never would have pulled out the Sword of Gryffindor, because only a true Gryffindor can pull the sword out of the hat. Everyone who's ever wielded the sword belonged in Gryffindor, otherwise they wouldn't have been able to use it.