I feel like a lot of this has to do with his simplicity.Really enjoying him so far. I just suck so I'm really not qualified to give any useful stuff. Though his character forums have been awfully quiet these days :/
You see a really effective style of play for him that doesn't require a lot of extra flare and pazazz and since that isn't required there's not a whole lot to really discuss as a result.
That's my take on observing a lot of good Atoms and playing/labbing him.