Runaway Mine Train is an odd one. The (not) rock work looked fantastic from the outside, and combined with the queue and music, made the experience feel like a very mini Big Thunder Mountain. But, on the inside of the (not) rock work, it was just the grey shell and supports holding it all together, and I believe it was always damp. If it rained heavily it usually couldn't open, probably because it had filed with water. After nearly 30 years, it certainly needed replacing.
The new style for me seems a decent installation. However, having removed all of the (not) rock work it does visually lose a lot of the niceness of the scenery, the slight mystery of the route the ride takes, and an increased perception of speed due to moving close to the scenery.
Would have loved to have seen some combination of the two.