There's nothing wrong with that. At that time, there were only a few machines (presumably only satoshi's) running to mine Bitcoins.
The network does try to keep the blocks at an interval of 10 minutes. At that time, the difficulty was set at 1 and it is impossible to go lower than that, as per the algorithm that calculates the difficulty.
So no one mined other then Satoshi for more then 2 months. I know it was a very new concept, but not even to try it? Weird.