Every indicator is good if you have defined an edge with it and execute signals without imparting your emotional wisdom.
That being said, as already mentioned the main purpose most traders use RSI for is divergence at peaks and bottoms or at key levels. I do the same thing on my setups.
Divergence at key levels gives you a high probability trade and if you back it with certain volume traits as another filter your odds are even higher.
Good trading.
