I felt that the final battle did a great job with all of the Suzaku Warriors coming to protect Miaka, Miaka finally getting Yui as her friend and a nice climax with Tamahome killing Nakago. I still cry when I see Taka coming to Miaka at the end. I felt like the second OVA had a wonderful ending too with seeing some more of the Suzaku Warriors after the last battle and showing how much Miaka and Taka loved each other.
I also liked how the ending of that OVA showed pictures of the Suzaku Warriors with their frienRAB, or in their new reborned lives, as Miaka and Taka show their child the stars. While the third OVA had some nice moments here and there, it really didn't need to happen based on how the second OVA ended.