Curious definition of smart. Sort of like saying a compass is better at finding magnetic north than I am, ergo it is smarter. The oil droplet is just a tool, like the compass, which always reacts the same way given external stimuli. Now, the people who knew enough chemistry to create such a droplet, those are some smart people.
I'm curious, though, how they'd do at running a person sized maze. Certainly they'd be beaten by the droplet, but I bet they'd also be outperformed by the mouse.