I'm not sure that calling it rubbish is even all that accurate -- it's not bad for what it is, and competing modern options like LZO and LZ4 aren't much better, they're mostly just faster. It's annoying that they didn't include both a fast and slow compression, like they did with cabinets and wim, but I understand that they solved the 90% problem and going beyond that would just mean new UI work and lots more testing.
What's rubbish is that fact that it's not used by default on all installations since 2004 or so, by which point the disparity between CPU overhead and reading from disk had become completely absurd and file compression was rock-solid. Every OS since XP SP2 should have made it mandatory; it basically halves the overhead of OS and program installs, and is like a little extra space for everything else.
Biting the hand that feeds IT
