Nothing reduces my confidence more than getting to a lake or river after days of heavy rain to find muddy water but that's mainly because I'm use to fishing ultra clear water.
The upside is I love throwing a spinnerbait and while I do well in clear water with them because they trigger a reaction strike, they excel in murky water.
That said,
Last year in very muddy water on a lake I've never fished, caught my only fish on a black Senko....... black gives the best contrast in dark water. Imo