I think the first thing you should examine is your target audience. Who are they? Gender, age range, genre, interests, etc.
Examine and develop the story, series from the feedback of your audience. Plot, Is it logical? Do the events or developments makes sense or connect together during the episode/series What is the goal or aim for the series to accomplish?
Characters: Focus on different aspects or characters in order to develop them throughout the series Focus on character interactions with a small group or team. shows like CSI, NCIS, Criminal Minds and even My Little Pony, Malcolm in the Middle, are good examples.
Recently i've been into Grimm, which I find to be really fascinating and their takes on fairy tales is really interesting - I like the modern spin they have on the classic stories. And the creatures themselves or "Wesen" as their called are very fascinating.
Johny test has a prozen formula. Young Justice is kinda sucky when it comes to story telling. The first season was great but now it broken up and the only reason I watch it is because i LOVE robin and superboy and the action and awesome look of it. The great stuff from the first season is pretty much gone as this point and if they dont get cancelled it might be better next season.
I'm guessing that is what your referring to. So I should make sure there is no story connecting each episode and to make obvious joke that are just painful to hear.
Season one they had to prove themselves. Season two diplomat problems. The best part of was when the war ship was going to destroy the planet. Wait that's not important what is important is that there are evil aliens and they are doing nothing to stop them. Ben ten alien force knew what to do, Stop the aliens!