Not at all. Fretless is just as valid as fretted in every style of music, I reckon. The only time I object is when it's really cheesy. I played a fretless almost exclusively in my old funk metal band and it was fine, it really added something, but it was subtle, sounding like a fretted most of the time.
Go forth and groove, don't let your lack of frets hold you back
ped