You cannot be serious. Windows ME was buggy as hell and an unfinished product that was simply unusable. You can certainly compare ME to Vista in that sense.
But Win8 is fast and works very well. The Metro UI itself is a matter of taste, but still, it does work. You don't like it, that's a different issue. It is not a broken technology. There is a difference between a broken and a frustrating technology. The latter will not affect users the same way as it will mostly be a matter of habits and usage. For example I personally think the Metro UI works very well in a dual-screen environment, so it suits me.
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