But in business the positive thinking thing is often a big warning sign - it's normally an indication of the delusional.
People seem to think that if they believe in something it'll happen...
Pretty much why the current economic mess happened.
Perhaps the bad to good hierarchy is:
1) Positive thinking.
2) Common sense.
3) Rational analysis.
Or at least temper (1) with (2) and (3).
Moose