I am using brew because it works, as simple as that. If in 99% of cases I can type "brew install stuff" and it installs stuff, I am happy. Does it have outliers? Sure, as pretty much any other software, sometimes it breaks. But it delivers environment where I can install stuff without wasting my time on boring crap like figuring out how to build it and resolve conflicts with other crap - it's enough for me. Even if it only does that in 99% of cases, still much better than not having it.