it's fair to say the game enables many different play styles, but it doesn't have classes, unless you think a class is nothing more than some starting attribute bonuses and whatever grab-bag of skills you choose. I expect a class system to affect game mechanics in a deeper way (eg, in KOTOR you get different allowances for attributes, feats, and skills depending on your class).

FWIW, I actually prefer the progression system in cyberpunk. rigid class systems make more sense in party-based rpgs. I just don't think it's accurate to say the game has a class system; it's more like it intentionally has the absence of classes.