sadly no one actually bothers to explain exactly what is supposedly wrong with nintendos online infrastructure... from my personal experience i can say its mostly identical to xbl in terms of features its just not as convenient to use (i have no experience with psn to compare) i also dont see how nintendos online services are relevant for a third partie service to work... I mean I get that nintendo has to take online sessions and direct them to the destiny servers but destinys servers are handled by either Bungie or Activision (if not then WTF)

The major problems that make it weaker (now beware I'm not a software engineer I'm mainly paraphrasing a developer who was having trouble with Nintendo I don't know exactly where the interview is I can try looking for it) are that it runs on older tech that are not as well equipped to handle the dynamic nature of online play. Also their is more than just servers required to make a connection an Nintendo apparently hasn't invested into these connections. Like I said I'm not a real heavy computer guy so my explanation is a bit vague. Others (such as developers) can better explain with more technical terms.