I don’t know what is the specifics as to why, but when I see a poster or something, I can instinctively feel if it is made with Canvas. I don’t know if it is the font, colours, how generic the templates are, or if it is the stock images, but I instantly feel a repulsion towards said graphic design. It doesn’t matter what style or vibe it’s going for, but I instantly hate it.
Might depends on your chosen interface/browser.