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Infancy
Colin has the best point here. Praising XBLive on the 360 while damning GFW Live is like asking why a five year old can't drive a car as well as a 40 year old. MS had a similar console platform in the original Xbox in order to work out the Live kinks, and perfected it in the 360.
The PC is a broader platform that doesn't have the luxury of being able to do one thing and one thing only; the Dashboard for the 360 IS the entire UI, so they had to put a lot of effort into it. While I agree entirely with #s 10 and 9, the other items really do require patience and a lot of healthy feedback before GFW Live can coalesce into something worthwhile.