The Old NES games, of course, the levels were not too large, thus a time limit is a good thing...
On games with large levels, like SM64 or even YI, A time limit would make the game a mess. For example, in YI, say you were given a 400 second time limit for World 4-4... My personal record for beating it, with ANY score, Is 6'36"00 or thereabouts. That is 396 seconds. A time limit in YI would make getting a 100 in some levels a real pain. As for SM64, most of the fun is in exploring the levels! A time limit would mess it up badly!
As for self-scrollers, they are the bane for me in any Mario game. In fact, The Worst level in any Mario game ever made in my opinion, 6-5 of YI, is a self-scroller. They are normally easy, and the fact that you have to go at the game's pace (usually to slow for me) makes me bored.
Cuando yo me siento aquí, reflexionar lo que aconteció exactamente con mi vida, yo me dí cuenta algo. Algo interesar. ... algo que no era bastante correcto... algo que pareció hacer mi vida incompleta... algo que hizo mí se siente vacía adentro.. ¿Tan, usted sabe lo que hice? Absolutamente nada. Era el mejor desicion de mi vida. Mi vida no bastante correcta vacía.