Very average
Indoors with all the lights on, it would jump up to ISO 1600 (full auto setting). Yet, in a side by side comparison, my XTI would sit comfortably at 400 ISO. Why the difference? Manual settings with the exact same lenses between the two produced nearly identical images.
Camera build quality; button location; flip out screen; the way it feels in the hand; high megapixel count; live view; it's a Canon
High ISO means nothing when the result is garbage; I actually owned two of these, after returning the first one; It wasn't a fluke; The average consumer might not notice this, but a professional should.