I loved it too and yeah it was a bit cheesy but all the HP books are cheesy here and there. It was great how Harry told Voldemort where he'd gone wrong, and I liked how he used Expelliarmus. It shows how the Order and the DA would rather give people a second chance than mindlessly kill like the Death Eaters, and I don't think Harry would have been emotionally and morally capable of casting the Killing Curse, even at Voldemort.
The best part was when just as Voldemort dies, the sun rises and all the people Harry loves come to celebrate with him

*wipes tear *