They all look cool. I think Flash forward will get old pretty fast, it'll be like lost but just pure "flashback" moments...and they were shit xD
The war one might be cool, if its 1 tenth of what band of brothers was its worth watching i'd say.
I recin that alien one will probably get old fast aswell...its lame..if they ended these things on a high like 1..maybe 2 seasons they'd be worth the watch. But it just drags on and on.
Curb your enthusiasm is gonna be fucking tits <3