In many ways, I owe much of my success to the power that R has allowed me to wield. Multicore lapplys and ggplot2 are my life these days. But even with this, R drives me absolutely batty, and the documentation, even battier.
I may be competent relative to most, but R feels so taped-together and idiosyncratic that even on my best days, I just feel like a newbie who's built up an army of ugly hacks.
Someday, I'll learn more about the python stats tools and do my stats there. But for now, R it is. Troll on, you crazy bastard.