PRYDE OF THE X-MEN did technically air on NBC, they just never bit for a series like Marvel wanted. They just would occasionally run it as part of their Marvel Hour ("Marvel Action Universe") block in 1989 (a block that had DINO-RIDERS, ROBOCOP: THE ANIMATED SERIES as well as reruns of the 1981 SPIDER-MAN series as well as reruns of SPIDER-MAN AND HIS AMAZING FRIENDS from 1982-195). PRYDE was entirely financed by Marvel.
I was basically agreeing with you, dude. The X-Men have a better track record on TV than Spider-Man since the 90's. Hell, by the time FoxKids bit on a stab at their own Spider-Man show, X-MEN was already on Season 2 and helped pave the way for all the other Marvel cartoons in the 90's.
Still, I would like to see SPECTACULAR SPIDER-MAN get a third season, but that depends on how it does on Disney XD. Honestly WOLVERINE AND THE X-MEN has also gotten better promotion; in comics and to general X-Men fans; SS-M is simply being geared to kids, not all ages, and that is inferior promotion frankly. But, yeah, as a TV commodity, the X-Men across now three networks have proven to be a ratings hit (four if you count that EVOLUTION reruns on CARTOON NETWORK did do well for the short period they they were reaired there).