The people I know who have had disappointing marriages have a common denominator, and that is that they expected to live happily ever after.
My best friend and I have both been married for decades and we regularly grumble to each other about what total arses our husbands are. But we are still both happily married and expect to be so for the rest of our lives.
We just expected to work hard at our marriage ever after rather than just live magically happily ever after.
Life, and marriage is not all unicorns and rainbows, and people who say things like "oh the spark died" after 2 years piss me off a little bit. Of course the spark dies. Its not an everlasting sodding flame, you have to fan it now and then, feed it a bit.
Sometimes its just a damp fart that you put up with. Love my husband to bits. Wouldn't change him. Still want to smother him with his own pillow sometimes.... Like now... its 4am and the fucker has been snoring like a train for three solid hours.
I have also observed that people who DO claim to have fabulous marriages are sometimes accused of being goady or over compensating (although I have a deep suspicion of people who never argue - what's that about?)
But it does seem to be a badge of honour to be able to complain about the insufferable arse you have to live with, and you are a smug bastard if you say, "mines ok actually".
We are all difficult and annoying, and float along the spectrum of how unbearable we might be at any given time in marriage or friendship.
I do think that the standards of "happiness" in marriage are a bit ridiculous. Sometimes I think I have the best husband in the world simply because he came home from the supermarket like a triumphant hunter having claimed a bargain in the reduced chiller fridge and other times I get all stabby because he's left his empty yoghurt pots lying around and the dog got to them....
We should spend less time looking at everyone else's marriages or relationships like nosey neighbours and more time putting the hard graft in....
I also think forums are not necessarily the best place to gauge, as oft times people are here to vent, get support through a genuinely terrible situation, or ask if they AIBU....