What a total dick move that was. Not only does he announce the scores when they're not final, but they even dressed the entire hall in Slythering banners as if they had already won.
shareSlytherins are full of themselves and probably already knew they had the highest score so he was teaching them a lesson
shareWell, you seem to have forgotten one thing: that three of the Gryffindor students had just stopped Voldemort from regaining his power. You don't feel that such a thing should have been rewarded?
Besides, the Slytherins had only been portrayed as one-dinensional jerks by this early point in the saga. So it was hard to feel sympathy for them at the time.
And a third thing to consider is that McGonagall had taken a fricking 150 points from her own house in a bitchy manner, so it was only right that Dumbledore restored the score to what it should have been if that hadn't happened. Like I said in another thread, Dumbledore was really understanding when it came to the students having to break a rule now and then. And thus, even though he had to let teachers enforce the rules and punish anyone who broke them, he would have been glad to find a way to circumvent them like this, especially if new things happened and deserved to be acknowledged.