Undoubtedly good; how could parent not having to constantly fear for his son with a life threatening disease be considered anything but?
Without the Tsarevitch suffering from haemophilia, as everyone else has already pointed out, Rasputin would never have made it anywhere near the court in St. Petersburg. However, Nicholas II would still have been a rather well-meaning but dim individual completely dominated by his overbearing wife. Rumours concerning Rasputin’s control over the court only started circulating after the personal prestige of the Tsar had already been badly damaged by the poor handling of the war effort.
In all likelihood the Tsar would have been forced to abdicate at some stage in early 1917, and here is where things get more interesting; when Nicholas abdicated, he initially did so in favour of his son (who was then twelve years old), with the expectation that Grand-Duke Michael would act as regent until Alexi reached maturity, but when his doctors advised him that his son would not be likely to live long separated from them, he amended his abdication to include his son as well. Without the haemophilia, the incompetent reign of Nicholas II might have been replaced by a regency period of the extremely competent Grand-Duck Michael, with whose help the Provisional Government might have been able to bring about a more general stability and stave off Lenin’s coup.