Earlier quoted context omitted.
MRI Ruby is actually significantly faster than CPython these days.
Citation needed. Both CPython and MRI are slow - if you need computational speed, use something else. But when your are comparing them to each other, CPython is faster. I don't know where you are getting that significantly faster bit from. Since most benchmarks are unscientific, this one is as good as any. So here goes: http://shootout.alioth.debian.org/u64q/benchmark.php?test=al...
2) Your conclusion "this one is as good as any" doesn't follow from your premise that "most benchmarks are unscientific" -- "this one" might well be different from "most benchmarks".
3) If your conclusion was correct then that wouldn't mean that the benchmark was good, just that it was also bad.