Playable when half of the game systems are not included? It is like saying Skyrim is playable if all you could do is walk around.
Not quite. If you're going to go to ludicrous lengths by comparing a 4X to an RPG, it's more like being able to do most of the basic stuff, but no pretty much essential minigames like lockpicking or alchemy. You can play the game without them, but it's harder and not as fun, plus it requires some workarounds (i.e. bashing the door down).
@Bayachay: I feel they've faced up enough and should concentrate more on patching things up, but I guess that is down to opinions.