The line "the stars... are going out" is a steal but that's all that's been taken from the story so in terms of substantive comparisons I think the Buffy one is more informative.

I like Donna but I think she had better material earlier on. The Unicorn and the Wasp was an unpleasant throwback to The Runaway Bride, she was sidelined for much of the next three episodes and in Runaway Bride mode again in this.

I never really saw what was so great about Rose but I didn't particularly object to her either.