I can't believe I'm saying this, but I agree that R1-20 is too fast. I'd like to spend more time at the R1/R10/R20 camps -- it seems a shame to me that we zoom through the first 20 ranks and spend so little time at the camps for those ranks doing those leves and grinding on the mobs. Not to mention having your progress slow down do dramatically after can be discouraging, IMHO. And this is probably a strange thought, but I kind of feel that making R1-20 so easy and quick doesn't really help with the issue of class uniqueness.
I don't think it should take more time overall to hit R50, but I think the curve should be evened out a bit. Just my two cents! ^^