I always try any indicated fingerings but 90% of the time I end up rejecting them and devising my own. This is particularly so with ragtime, stride, swing and any music where discontinuity of sound is vital. (In much of classical the object seems to be smooth continuity, which is a lot easier to work out fingerings for) In rhythm music, the whole feeling can change consequent to a seemingly trivial alteration in fingering. Worse still, the effect varies from person to person, and a really silly looking fingering might be just right. Then again, I suppose that's what makes it so interesting, among other things.
In general I find fingerings to obtain continuity or legato require much less thought (not necessarily easier to play though) than those involving many jumps and position changes, or where you have to finger to suit rhythmic groups and accents.
A case in point is Johnson's Carolina Shout. The few indicated fingerings of Scivales are absurd for me - perhaps he's never played it up to speed. Unless they are printing errors, he seems to have just plopped a few numbers in here and there at random. The same goes for my edition of the Chopin study in thirds. The indicated fingerings would be all right if I never wanted to go faster than around a fifth its usual speed.