Heartwarming / Glorious Shotgun Princess

• When Shepherd Exalts as a Solar, and her vision from The Unconquered Sun. And later on, when Garrus Exalts as a Lunar and his own vision from Luna The Changing Lady. It's just such a tremendously powerful and beautiful moment, and some of the very best writing in depicting what it really means to be Exalted by the Celestia Incarna.
• The fact that there are Quarians on Rannoch, protected by the geth says a lot about the geth's loyalty to the Creators.
• Mordin curing the genophage. Even more heartwarming, doing so is enough to let him Exalt.
• Jacob gets one in that during Kasumi's Heroic BSoD he rejects her offer to give him anything he wants and instead gives her a hug.