I completely agree with you. About RMC Mean Streak, I actually made a concept of that about a year ago, here's the link if you haven't seen it:
My computer is actually pretty weak. I have a NVIDIA GeForce 920M, i5 at 2.6GHz, and a 750 GB 5400 RPM drive. Like Projektion said, I'm using the in-game recorder so it really doesn't matter what computer I have. However, this park, now that it's done, runs about 10-15 FPS around medium settings, which isn't too bad considering how much is going on.
I do a ton of modeling. The whole station, path area, fencing, theming, Paddlewheel boat, pretty much everything that isn't a tree or a coaster is done by modeling. Most of it is pretty basic or just replicating but I actually designed the station as well. That actually took longer than the coaster itself.
Thanks for all the positive feedback! It's great to know my work is being appreciated.