Depends on how you define 'cheesy'. To me, 'cheesy' means you can tell that the music is coming from an Arranger. That doesn't mean it's completely bad, in fact, in most cases it's far superior to what that particular 'musician' could produce without 'assistance'. I truly believe that ALL the manufacturers deliberately make the styles generic enough that amateurs and home players will sound 'good' and yet make them (styles) functionally and structurally strong enough that they can easily be tweaked up to a level suitable for (and acceptable to) the 'pro' player.
SOOOO, are Roland styles 'cheesy'? In the context that I described above, YES; BUT SO ARE KORG, YAMAHA, KETRON, AND CASIO. Can they be made to sound UN-cheesy? Absolutely, as some recent demos have shown (including some by guys like Marco Parisi, et al). In the end, although the quality of a Style is important, it's the player that 'puts asses in the seats'. JMO.
chas
_________________________
"Faith means not wanting to know what is true." [Nietzsche]