Ugh horses are so loving inconsistent with the rest of miencraft, this is what Mojang gets for letting sub-par mod makers into the vanilla game.
-Knees
-Feet
-Fatter upper-legs
-Armor that sticks directly onto their skin, not slightly above it
-One single armor piece
-Gold armor is better than iron armor
-Multiple variations
-A mouth (save endermen, but that's not really even a mouth)
-handicapped sounds
-Screw up hunger bar and UI (repurposes xp bar)
-Overcomplex breeding mechanics
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First off, last time I checked, they don't have knees. Secondly, they will fit in quite soon. I heard they will add Randomob Support to the default resource pack sometime soon so there will be variations of pigs, zombies, cows, etc. Plus, the Ender Dragon has complex features like the horse. Now, I agree with the handicapped sounds (mostly when they are damaged), but you don't need the hunger bar when riding a horse as you do not lose hunger on it. Breeding mechanics are not very complex at all, actually. It's just that you can feed it something other than wheat or seeds for once. Sure you could get technical and look at how each food gives it some certain percentage to have more health and such, but who needs that? :D
Mouth? Really? Ender dragons and endermen have them, too. And, yes, they loving count.
Gold armor being better than iron makes no sense, though.
Honestly I think the update is sweet...but for some reason multiplayer is laggy as hell now.