I have seen many O gauge layouts just as shospicated as the finest HO layouts..
It depends on the time effort and talent in detailing applied and focusing on prototypical operations and accuracy. HO is no more an art form than O Gauge or O scale. Modern O and HO are equally authentic these days. It all depends on the level authenticity that is applied. This is where clubs excel verses a lone modeler. Again the fun factor lies with each individual and what level of realism they wish to apply'... I've had HO and N trains. O is the most fun to operate and detail as well.... Just my 2 cents..