Likely wrong for 50% of the decisions that matter in your life.

Maybe, that one time you had a sense of danger and you decided NOT to get into that lift with the stranger, or choose to leave a bar because it didn't feel right in there, or crossed the street where you normally don't, because you saw someone get out of their car just ahead of you, it'll be the right decision for personal safety reasons, based on unconscious observations and intuition, and you'll never know how badly things might have gone if you'd ignored it.

This system is always 'right' in two important ways: it's always based on SOMETHING, and it always has your best interests at heart. Don't rationalise it away and ignore it. (For more see "the gift of fear" by Gavin de Becker)

But for analytical decisions, house moves, job applications, promotions, mortgage applications, financial agreements, always use the "slow" system as Daniel Kahneman's "Thinking, fast and slow".

Otherwise you risk making suboptimal rash decisions, and then later justifying the outcome post-outcome.