This is not about how you get used, this is about how you repay someone after you get what you want. Sasuke willingly came to Orochimaru seeking power. Sasuke got what he wanted. Ive seen countless movies where someone gets trained while used for evil plans and later on when their student attempts to escape and try kill their master they show certain respect for their knowledge, they don't prepare speeches and all that...[QUOTE]
Orochimaru was the one who plant the seed for Sasuke to come to him.