What made MI so special for me was it's humor, that it was a friendly, non-violent setting and most of all the mood. I think a lot of the credits go to Marc Ferrari for his absolutely fantastic night sky. If the first chapter would have been at daylight, I think it wouldn't have worked out that well. Same with MI2. Or especially LOOM!
When I think of it, most Lucasfilm Games start at night. Maybe the reason why I liked them so much 😉