To my mind, indicators are extremely useful, especially for the traders making decisions based mostly on technical analysis. Most of the traders use indicators to get an additional confirmation for the entry singal provided by other pattern (like chart or candlestick one), while there are also some strategies based solely on the use of indicators as the main elements. Another advantage of inidcator-based strategies is that they could be easily automated. For sure, it seems quite difficult for newbie traders to ge familiar with the huge nubmer of indicators available, so is would be better to focus on the most interesting ones.