This will be tough because I agree there is no bad RMC or even a "less good" there are just "less great". The least great RMCs are better than 80% of everything out there. So how to rank small differences in greatness?
No doubt #1 is Steel Vengeance. It's perfect. Got tons of everything, great layout (some RMCs do strike me as kind of random), great pace and flow, long ride, just perfect. Agreed with above comments not sure how honestly it can be topped. Perhaps Zadra, Iron Gwazi or Hakugei or any future massive one can equal it, but yeah how can it be significantly improved? Then again I don't have an engineering mind so who knows!
2: Wicked Cyclone. I hear the ride has lost its pace and bite. I've not ridden since opening week and the park is closed this year, so can only go off my experience and it was superb. Basically I felt how I did with SV when that later opened but ofc it's much bigger and better. Whenever I ride this again it probably won't hold up but till then.
3: Storm Chaser. Bit more violent than the above, don't like the layout quite as much. But wow this ride, and the straight up airtime hill in the middle, I left the restraint just a tad loose and it was perhaps the greatest airtime I've experienced.
4: Twisted Colossus. I love it. It has everything and IS a pretty long ride. Yeah yeah the slow ass lift....I'm fine with it. If it was just one lap we'd say wow that was wild! Bit short though, and run back on. Well, no need for that, you get 2 rides for the price of one
5: Railblazer. F***ing nuts esp in back, just a bit short. Honestly it may be better than TC but well...TC is longer so it offers more.
6: The Joker. I loved it. Great air, elements, layout and pacing. It really is kind of perfect, but doesn't have anything too unique. If it did throw one or two other things in there may be higher, it was crazy fun. Also back row drop was pretty intense.
7: Twisted Cyclone. Bit on the short side. What's there is superb, but it doesn't pack quite as much as the other RMCs have. It does have the wave turn, and that sideways ejector air is something else.
Was due to hit NTG, IR, TT and most painfully LR this year... all are scrapped so the list ain't changing. Maybe 2021.