1.8. The introduction of horses was about the only thing particularly interesting, and I've never liked the introduction of all the useless blocks like diorite Ocean monuments were cool, but useless. Your reward for concurring one is 8 gold blocks and some sponges. Rabbits are also useless.
I'd say the saving grave of 1.8 were the improvements of commands in minecraft, which aren't even useful in survival mode. So honestly, I didn't care for it.