I think its safe to say that Obama has probably been by far, the most effective United States President regarding dealing with Terrorism, their sponsors and dictatorial regimes.
I had to re-read this a few times... but I think you're absolutely correct.
Reagan, bush 1&2, clinton...
It's tough to argue Obama hasn't killed more leaders than any of them... hell, combined?
Bush gave us a solid foothold but never was able to "get" the bad guys aside from Saddam.
I wouldn't be surprised if Obama turns his attention to North korea or venez now... both with ailing leaders... and start making some demands.