estevan carlos benson See to me SCSS pre-processors such as LESS and SASS offer no improvements worth mention, and strike me more as just letting people vomit up more bad CSS out of a lack of understanding how to use HTML or CSS properly.
Both mixins and variables are great examples of this since they generally just mean you don't know how to leverage selectors properly. I think this goes hand in hand with the current halfwitted practice of throwing multiple presentational classes at everything to the point you might as well go back to using HTML 3.2 and pretend CSS doesn't even exist.
It also plays to the simple fact that MOST people right now are writing two to ten times the HTML necessary mated to ten to twenty times the CSS required to do the exact same job!
If the markup follows semantic norms I can typically skin an entire forum or CMS in 48k of less per media target on the CSS side. This is why when I see today's typical herpaderp "I cans haz teh intarwebs" mouth-breathers vomiting up a quarter of a megabyte of garbage for a squeeze page to double that or more for a CMS, I have to choke back the urge to introduce boots to backsides.
... and since 48k is the upper limit I would EVER allow for CSS on a page, that plays to a final issue I have with pre-processors. If something like SCSS is actually delivering you any real benefits, you likely have too much HTML and CSS to begin with for the task! JUST like how on the JavaScript side people keep wasting megabytes of JavaScript on doing markup and CSS' job.
About the ONLY claim about them that holds any water is automatic browser prefixes, but with everyone EXCEPT Apple having kicked that idiocy to the curb for all but one or two corner cases, even that claim is sinking fast.
Oh, and the "Pakleds" were a race on Star Trek: The Next Generation, they were... well... how to put this delicately? Ever heard the Jeff Foxworthy joke "We hope there's intelligent life out there, we really do, 'cause what if we're it?" -- they are a prime example of that scenario. Mankind encountering a race so stupid one cannot fathom how they made it into space. (turns out, they found it... which is why they look for things. Things to make them go.) To call them retarded is an insult to people with mental disabilities. They were special... in the same way some Olympics are "special". On a scale of Peter Griffin to Intelligent, they're somewhere down past the creationists.