I'm generally not too picky about having every little detail in the score. I figured people will take it too seriously and not enjoy playing the piece. You definately have to find a balance between too little and too many. For me, if its something that should come natural, (like a slight crescendo on an upward run, for example) no need to over mark it. A good musician should do that anyways. Now if its something not so obvious, (like a decrescendo on an upward run) then it's time to mark it.