at a minimum it is good to know when the news reports are, etc. so you can decide NOT to be in the market because that immediate impact can totally invalidate any other signal you are using. if you are scalp shorting YM because of xyz reason (tick hook combined with fib resistance and some tape reading weakness) and some report comes out 30 second later and the dow reverse and rams right thru yer stop - well if you had known the report came out @ 10, that could tell you to stay out and wait till the reacion.
we all know that what matters is not the news, but HOW the news affects the market, and since the market is a derivative (traders trade based on "how will other traders THINK this affects other traders" - think about it), it is very difficult (but not impossible) to be good @ predicting how the market will respond to X, before they do, or even moreso what the news result will be before it comes out
i have, on occasion took an edumacated

prediction as to a news result (i did with a court decision before it came out once that affected YM and MRK because i have a lot of experience in civil law), but the more prudent course the vast majority of time is to play the tape. wait for the reaction to the news, judge the waves of reaction, and play it accordingly
imo
or you can choose to sit out the period immediately around scheduled news, and wait for equilibrium to reassert itself
since we, as traders, benefit from disequilibrium though (*that is what moves prices - disequilibrium between supply and demand), playing the news is a way to make money
but it's tricky no doubt