I understand that the job of the GM is to react to what the players do, and make an enjoyable experience. But what drives me nuts is either, when the GM shuts down after not following the plot, I just suggest a little prod to get back onto course. And the second is the GM with noplot at all, or secondary plots. RP to me is trying to copy real life, and in real life there is "subplots" and it always moves. I understand the struggle of having multiple plots, and the pain from not having the plots used, I have a google document with 8+ pages for about 16 plots. For 2 RPs. But the lack of solid plots and workarounds really sets me off.