Yes, this mod was one of the original greats for RF1 and still is.
I think the fact the all cars had the same sense of effort put into them, regardless of how unpopular the car may have been, may be part of what made the mod so great. You can really feel the quality and effort in every car. Apart from that, you can really feel the difference in every car in terms of physics, sounds, graphics, cockpit, etc.
The fact that there was a track pack pretty much made for this mod, I feel, played a huge part in it's popularity as well. A track pack along with a carpack is basically a game on it's own. We don't even need a new GP79 track pack, simply ported the original ones to RF2 would be good enough for now, I'm sure people can and will update them further over time, but just the basic track with the basics like realroad, etc. would be good enough for now as a starting point.