I always cringe to think about poor old Charlotte with Mr Collins, but then, 'I ask only a comfortable home.' In those days presumably even a Mr Collins could be better than ending up an old maid with not much money, and being shunted between relatives who didn't really want you.
Whoever said Anne Elliot was a snob, I can't say I agree - especially not compared to her ghastly father and sister. Why would she have bothered with the poor, disabled ex-school friend Mrs Smith, instead of visiting titled relatives, if she was?
An evidently thoroughly happy marriage in Persuasion was that of Admiral and Mrs Croft. But then they had no kids, which could certainly have been a factor in JA's mind, given that she witnessed at least one SiL having one baby after the other, not to mention one of them dying after giving birth to the 11th, IIRC.
It's a later era than Austen, but for my money Trollope wrote the best female characters - all sorts, but for a Victorian, relatively few, if any, of the cliched-clone type.