I've carefully thought this answer out and I believe it to explain this question to the best of my ability, however it is subjective and I will not shy away from that.
NZXT has grown to be known for a certain style. That style is not necessarily "not classy", but bold and sometimes extreme designs. These designs either inspire love or sometimes loathing with little between. It is because of this that it can very easily not be considered classy by some. However if classy means simple quality designs, I believe we absolutely make classy cases. Off the top of my head (Khaos, Source, H2, and the case being used in the Aqua S build).
