This submission has been removed because it violates the rule on poll-type questions. These poll-type questions do not lend themselves to answers with a firm foundation in sources and research, and the resulting threads usually turn into monsters with enormous speculation and little focussed discussion. “Most”, “least”, "best" and "worst" questions usually lead to vague, subjective, and speculative answers.
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While this is something that I think most of us face, I feel that this question is more fitted for our weekly Friday Free-For-All threads than an open question. It is unfortunately all too subjective and there is no definitive answer as to why.
But then there's that old saying: "Smaken är som baken - delad" and I feel that essentially sums it up. What's important to you and I is unimportant to someone else. Just like not caring about politics, religion, science and what not.