In my opinion, if humans never felt happy, sad and every other emotion in between, the human species would be much better off.
A few things that would benefit the human race as a whole, IF human emotion didn't exist...
~once someone turns a certain age, they are killed
~the whole communism thing would work nicely
~races and religion would be obsolete, thus no discrimination
~no country's
Meh, I havn't put much research thought into this, but I do think aboot it a lot. I'm not saying that I'd like to not feel emotions (that's the last thing that I'd want), but I'm saying that as a species, it would be much better. Feel free to give your too cents to this thought.