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Does A6 provide a basic MP framework that takes care of synchronization, timing, and movement or am I left to develop everything from scratch?


There is an MP framework, and you can use it, but many people have had problems especially with the dead-reckoning. Ofcourse you can develop your own algorithms with the low-level networking features.
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Are the templates finally useful, or is it still like it was in A5?


I don't think there currently is any MP functionality in the templates. Templates for MP shooters are sheduled, though.
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Also, is GameSpace worth the $$? They are always spamming out their "Bundle-Wares".


I've tried the Light version, and I think it sucks.

shader tutorial