It's a relatively small criticism, but something annoying nonetheless. Nightfall hasn't changed much about the fundamental Guild Wars experience, but in all honesty, it probably doesn't need changing. This is one of the most streamlined, attractive, and accessible MMOs available, and there are many games out there charging a monthly fee for a decidedly inferior experience. The implementation of the Heroes may not be perfect, and their applications in PvP something of an afterthought, but their presence still adds a considerable amount of breadth to this already rich, rewarding game. If you're a new player, there is no better place to start than Nightfall. Veterans, meanwhile, probably don't need any encouragement.