This one gets a bad rap for a number of reasons. Specifically I think the Master's plan is a bit silly and leads to some awkward effects, but otherwise I think this is a strong and brilliant two-parter, all while bringing Ten's story to an end. I found the scenes with Wilf memorable and moving, and I have a lot of sentimentality for Ten going around and saying goodbye to everybody. I found the Time Lord plot quite dramatic and even intriguing at times, and like the little hints we might have encountered the Doctor's mother in this. Overall I think it is stronger than people say. I do agree it isn't the best finale in the world, but it does feel powerful in its own ways and far from the worst thing I've ever seen in this regard.