I've been much more impressed by another early access survival game, The Forest. They haven't just thrown in a bunch of top-tier graphical effects and hoped for the best - they're clearly working towards realism, which is reflected in both the graphics and the UI. And the pacing is far better - my first three hours with The Forest had so much tension, so many memorable moments, and so many surprises. I could focus on enjoying the game. In ARK I'll be getting stuff together for an hour, and start to have fun... oh, two minutes later I'm dead. Another hour lost to corpse retrieval or starting over.... I'm dead. Tamed a bunch of dinosaurs... oh, a random aggro and they're dead. Can't build anything locked behind the arbitrary XP system, can't find corpses half the time... it's too much hard work and not enough play, and it really does need 12-15 hours of tedious play before it gets going. I can't see ARK coming out before Q416 at the earliest in its current state of gameplay. But it's still quite promising. And you can poop (although The Forest has "you cannot carry any more legs", so they're about even there IMO).
At a sale price of $10 for The Forest (or Sale-$10 for 7 Days to Die, if you prefer a bit of Minecraft in your survival and don't mind graphics that look like an easy port to 360), Sale-$25 is just too high a price for ARK at the moment.