I've expressed much dislike for Tubular, and to this day cannot get through it in just one attempt. My strategy was to be small Mario throughout the level, as a smaller target for enemies might have a chance of getting through the level much easier. That, and if you get hit by an obsctacle as Super/Fiery/Caped Mario in balloon form, you'd lose a life, anyway.
Before though, back in 1996 or so, my brother and I were never able to pass Tubular. One day we were lucky enough, and then said to each other we were never going to play that level again.