First, is this nessisary? I can see alot of people using it. I need it because when I animate glados in SFM for a song and its very hard to make the her arms follow her body when it bends up and down... Also the pistons in her neck are a huge pain, but I guess I could suffer with it. Thank you for everyone who helps :)

This is my second SFM video I have made, I have been following tutorials like crazy this past week to try and improve. What do you think of it?
http://www.youtube.com/watch?v=QOL_cOdT80w
I need to learn how to make better cameras... I think the one in this vidoe moves to much.