Many TV series are quite disappointing because of several reasons.
For one, there's far too often filler involved. Just recently I decided to give Ergo Proxy a try because I heard good things about it and oh boy, it's got some of the most annoying fillers - although they don't recap the story, they are so dislodged from the story line that it makes them even worse than normal fillers.
And of course there're the endings. When it's a manga adaptation it happens far too often that the studio either runs out of money or the manga takes too long to finish and they quickly think up an ending all by themselves which most of the times totally sucks.
For one, there's far too often filler involved. Just recently I decided to give Ergo Proxy a try because I heard good things about it and oh boy, it's got some of the most annoying fillers - although they don't recap the story, they are so dislodged from the story line that it makes them even worse than normal fillers.
And of course there're the endings. When it's a manga adaptation it happens far too often that the studio either runs out of money or the manga takes too long to finish and they quickly think up an ending all by themselves which most of the times totally sucks.