SCRUM, I usually get two very extreme reactions to this methodology:
On one side, I get people that say you've got to follow all the rules. That's what SCRUM is! There is no but!
On the other side, I get people saying that there's no such thing as a one size fits all methodology, so you always need to adapt SCRUM for your particular scenario.
Now, I don't agree that you need to blindly follow all the rules of SCRUM. That's not Agile at all... remember the 1st rule in the Agile Manifesto? "Individuals and interactions over processes and tools". Seems clear to me that, if your team agrees that some part of SCRUM can be improved, the Agile Manifesto is there to back you up.
Just because it is ok to change SCRUM, doesn't mean you should. Failing to properly implement SCRUM is not a valid excuse to change the process "to fit your organization". That's the the type of attitude that gives ScrumBut a bad name!
Before adapting SCRUM to your organization, you need to implement and use original SCRUM for a while. It's only when you finally get SCRUM running smoothly on your organization (and that will take some time!) that you and your team can move to phase 2: Analyze the process, do retrospectives, and improve the process to better suite your needs.
And that's when the real fun of Agile and SCRUM begins!