One thing I didn't, even at the time, like about The Motion Picture was that tag-line 'The Human Adventure Is Just Beginning'. I don't know why, but it struck me as un-trek-ish and cold.
That is odd. It sounds entirely Trekkish to me -- what is ST about if not the human adventure? And neither humanity nor adventure seems like a cold concept to me.
I suppose it is a little abstract and impersonal, not about any specific character or their motivation. But it's an optimistic message with a lot of implicit promise, so I quite like it.
And there are worse taglines. Like TWOK's "At the end of the universe lies the beginning of vengeance." First off, what does "the end of the universe" have to do with the movie? That's just meaningless. And vengeance may be more personal, but it's a less agreeable thing to be beginning than adventure.
And then there's the infamous STV tagline, "Why are they putting seatbelts in theatres this summer?" Leading to the popular gag response, "To keep the audience from walking out." Really, not many of
the Trek movie taglines were all that good.