I actually like Spectacular's art style, it's easy to animate and it's not ugly, while at first it seemed strange it grew in me, there were even things they changed from the comics that i liked, like Brock being Peter's friend and Liz being hispanic instead of blonde again.
They made the characters likeable, they made the villains cool, they respected the source material and updated it, they took the best from each version of the character, from the movies, from the ultimate comics, from the 60s comics, etc. and made a great show. They knew their audience but they still made a smart story.
The creators of Powerpuff Girls and My Little Pony: Friendship is Magic also said they made the show for little girls, however these shows still atract a lot of fans that are boys, adults, etc. This is because they don't think a kids show doesn't need a proper story or to be dumb. Greg Weisman, the creator of Spectacular Spider-Man also created Gargoyles, W.I.T.C.H. and Young Justice, while i heard of these many times i never really watched them exept for young justice, which i tried to get into, are they good?