Is it worth getting IOS 9 for an iPhone?

I have a iPhone 4s and was wondering if it is worth it to update my phone from IOS 8 to IOS 9.

It's super slow now. All that upgraded was pictures where it has a "screenshot" album and "selfie" album. And in notes you can now draw and stuff. Also has "power saving mode" which I don't find too helpful lol! There's really nothing special. And more unwanted apps nobody wants!

Dude ios9 is optimized for iphone 6s and 6s plus i wouldn't recommend it i don't even think you can update