I may be alone in this idea here, but am I the only one who kind of doesn't like how even though TS4 introduced a mood system, your sims are always just as happy and bubbly as they usually were in the...
I don't really care about the naming but I do think "fine" should be the default and a more common emotion than "happy". Perhaps a sim needs a +8 buff of happy moodlets to actually feel happy?