Seriously half of you saying it sucks need to grow the forget up and respect what other people use. If you drive a loving Chevy you don't go around pissing and moaning to Ford owners and go on this rant about all of the reasons Fords suck ass in your opinion.
I highly doubt Gyazo was made for full screenshots, after all it isn't a screen capture upload, its a snip and upload. The people complaining the images are always broken, that's more than likely the poster was too lazy or dumb to figure out that the link copied to the clipboard immediately is a link to the Gyazo website page hosting the image, not the image itself.
If you don't like Gyazo,  fine, but calm the forget down, its a program for gods sake.