I don't really like how Atom looks in Pluto, though. And besides, if someone tried building him to look more human like that, he'd be creepy-looking- Uncanny Valley, remember? Things that don't look exactly like humans (like the Leo robot, for instance) tend to be cuter (and far less creepy).
But...but he's beautiful in Pluto ;-;
I LOVE Leo!

He's my favorite robot to date, and I'd much rather interact with him than that dull, creepy robot. I've seen far more realistic robots than that, though they don't seem to do as much. Yet. Heck, Leo is more realistic than that, and he's not even based on a real species. I really wish they hadn't stopped working with him. The progress they were making was excellent, and the current robot NASA is working on now is quite disappointing when compared to Leo.
I've see a couple videos of Simon, but it's just not the same. What NASA had with Leo was great, and I think stopping his development was a terrible choice.