She was magical. She walked into the Doctor’s life like she belonged in it. She wrote in Gallifreyan and she always seemed to know more than the Doctor. She was brilliant, and she was saucy and fun as hell.
Then she was a girl. A confused, lovesick girl. She tried to destroy the universe to prove her love, not bothering to come up with a better plan.
Then she was Professor Song again. She didn’t know anything special though, not anymore. She was just along for the ride.
There were no more stories to tell with River Song. The show moved on without her.
River was fun and clever and delightful. But she was an essentially flawed creation on Moffat’s part. There just wasn’t the storytelling time to give her justice. We didn’t see her fall in love with the Doctor; we saw her just being his wife. We didn’t see him fall in love with her, we just saw him kiss her goodbye.
We didn’t get to spend time properly getting to know River, because she wasn’t allowed to be in any “everyday” episodes. We know Clara and Amy really well because they’re always around, so we understand the nature of their relationships with the Doctor. But with River, the most important developments were always offscreen. Even the moment the Doctor took her to the singing towers happened between episodes. We never got to see him realize that he was never going to see River again. It wasn’t until the end of the season that we were informed that the sorrowful Doctor we saw in “the Snowmen” was, in fact, mourning all three of his Ponds.
In the end, spending tons of time with the Doctor and only rarely seeing River come into his life meant that he never really seemed like her husband, although she always seemed like his wife. It meant her character, which at the beginning was larger than life, was bigger than the Doctor’s life, was slowly reduced over the years until she was just his wife. And now she’s gone.
But I’ll say this: most of the time, it was fun as hell to watch them run.
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