The “warehouse” issue is inherent to Disney's trackless rides and one of the primary reasons I wish they’d move away from them. That said, I prefer MMRR to RotR by quite some margin - one captures the essence of its subject matter and one doesn’t. In fact, I think MMRR is superior to most trackless rides - BatB, Rat, etc. I’m no fan of screenz, but the subject matter and integration of 3d figures and props in MMRR make me much more inclined to give it a pass. I’d PROBABLY rather have GMR, but of all the great replaced attractions - Horizons, WoM, Imagination, Energy, etc - GMR to MMRR strikes me as the least egregious (if we ignore how easy it should have been to have both). Just my opinion, of course…