Candle stick patterns are definitely useful. Especially with the right context. For example; if you have an uptrend and you see a 3 bearish candles creating a higher low and the 3rd candle of this swing is a doji, pinbar, engulfing then the probability is higher that the price is going to go for another swing high.
Candlestick patters arent the holy grail. You definitely shouldnt trade every special bar you see.