The biggest mistake i encounter is people using them as long/short signals. This is really the fault of many erroneous tutorials available online (e.g investopedia) has this wrong. They tell you an up fractal is a signal to go long and vice versa.
Wrong
Limitations
Ranges
When you see many fractals being printed without clear highs and lows, price is consolidating. Wait for a clear break of the range.
Initial stop
Initial stop placement is at the previous fractal (often huge). I recommend using an alternative e.g 24hrATR