That does give a bit more merit to the Guardian's take, although I'm still not convinced that 'disastrous' is the right word to describe their marriage.
Thanks for the recommendation! 2500 pages for the five volumes is quite the read, but it seems well worth it.
Just to give you a sense of the problems in their famous relationship, Dostoevsky was once lost all of her belongings while gambling.
If you're interested further, Joseph Frank's five volume biography of Dostoevsky is a masterpiece in itself, and would give you a sense of how difficult, but also how strongly emotional their relationship was.