ISO 3200 use it or forget it?

When I used compact camera with a small sensor,high ISO above iso 800 will give a small effective resolution only. But when i bought a dslr, I still wondering how good it is regarding high iso performance so I make a test of it. A bird shot at ISO 3200.

This shot was done through a window glass. The result still showing a relatively apparent noise but in a same time, a details is very good. What is helped here is at lower iso, say about iso 200 this shot is not capable due to  a very slow shutter speed, but high iso ensured  me to get enough speed to freeze a vibration and bird movement.