SG
I was wondering whether I would start a new thread to discuss this. No more need to wonder: you have done it.
1) My opinion in short about this great game (I mean playing SP, since I haven't played MP at all YET
):
There are so many ways to play it (conquest, landing, level, size of map, records, ...) that many experienced players still find it fun, even after having played hundreds of games. But, IMO, micromanaging numerous big cities is a bore (and micromanaging to the level of precision of our friends OCCers does 't attract me either, though I admire them and thank them for all they have brought us).
My aim #1 is FUN.
My aim #2 is SLOW THINKING (spending long minutes to 'crush' my brains, trying to find a nice way to get here or there).
I found out recently that many scenarios are REAL FUN to play, and also provide ( to some extent) opportunities to think OTHERWISE (without huts, without wonders, without tech tree, ...).
2) About the objectives
Apart from some strategical advice given by Xin Yu quite a long time ago, I don't remember having read much about scenarios on this forum.
My strong opinion is that when there are objectives given by the authors, the interesting part of the game is conquering them (I haven't met one scenario yet where there appears the slightest chance to lose after having conquered them).
My strong opinion is that I don't wish to get bored playing endless endgames if I can avoid it.
AFAIK there are no established rules and this is open to discussion. (if you start a poll, you have already my vote :NO to boring endgames).