The charisms run the gamut from imperceptible to flamboyant. Those who quietly exercise their invisible or mundane appearing charisms are rarely denigrated. Those who, say, speak in unknown tongues are building themselves up - because they need building up. I will not deny them that edification.
Do they appear unstable or worse because our faith has been sterilized by modern culture? Something to ponder. Those who exercise their hidden charisms are doing their part for the edification of the Church. This is as it should be.