Role-playing something that is very non human in mindset (and not just physically) is very difficult, but it can also be very rewarding. Some of the best science fiction novels (or at least the ones I like most) usually develope an alien race beyond the simply human with a mask and an overdeveloped personality trait. The puppetteers from Ringworld, the pequinos and the buggers from the Ender's Game novels, the people of Karhide from Ursula LeGuin's The Left Hand of Darkness, the martians (though their mentality is displayed through the human main character) of Heinlein's Stranger in a Strange Land, amongst other notables. Of course it takes more work to create a truly 'nonhuman' type of race, just as it takes more effort to role-play one. But that doesn't mean its impossible. Just as a good actor enjoys a very challenging and demanding role, I personaly love a more esoteric role-playing challenge. Some people though like their games to be less of a chore, and role-playing a drastically inhuman mindset can be just that. If it makes the game feel more like work and less like play, then certainly, its not for you. I say, bring it on.