Bloat doesn't necessarily mean code size. It could also mean redundant selectors, code that is difficult to maintain, and plethora of other things. As mentioned previously, I'm a front-end web developer, I spend majority of my time coding graphically-heavy designs in CSS and maintaining them, as well as doing JavaScript. In my experience, Sass has been a nightmare.

So far, the only people that I've heard praise Sass are back-end programmers, rather than full-on front-end developers.