He is a dictator/autocrate/satrap, however you call him, he solely holds the power over Vegas, but as mentioned already, he doesn't interfere with private lives of the people, which just makes him authoritarian. I sided with him on my first playthrough and I always believed he's the best choice for Vegas (independent being my second favourite, though I always imagined without a strong hand Vegas would develop into something like the Hub - various group of interests fighting each other - which in turn would leave the city vulnerable to annexation once NCR would recover from the war).
Although killing the Kings was a dick move, I'll agree with that (same goes for BOS, but I've never had much sympathy to them).