Is it normal people are so ungreatful and make no effort

I read about peoples experiences with relationships and marriage sometimes but its often very negative. Bitter and boring people who complain. Earlier I read a womans post who was depressed because she has a wonderful husband who loves her and they have a great life together but there is no 'spark'. How stupid and ungreatful can a bitch be? I get the spark-thing but im nearing my late 20s and im already mature enough to see that its all bogus. I have chased it myself but in the end the most spark and passion are with unstable people who leave you guessing and act hot and cold because you get a lot of feelings from things not being predictable. It's not exactly exciting with an available partner who always makes sure you feel appreciated but it's good and no drama.
The way I see it people who complain about a relationship being boring are boring people. If im bored in the relationship I suggest things we do and then we do them. Why is it a partners sole responsibility in the first place to makes ones life exciting?! If youre bored get a new hobby or come up with ideas... I think a relationship should be a secure dock in your life and if you want spark, put in some effort. I've never heard a person who is not boring complain about boring relationships wether it's romantic or friendship relations but most people lack self awareness.
People seem to hate taking responsibility and communicating because they want to sit in their miserable victim shirt.
Maybe a solution for people who have great marriages but cant live without excitment and it has to come without effort, since they are lazy, should have open marriages so they can sleep around with people who are questionable commitment-material. In this day and age that would be seen as normal I think and it's better than cheating so it's a win-win situation.