Ultimately filler could be good, and done right....if and this is a big if. The writers hired to do them were truly professional and not Fan-fic hacks with no sense of plotline of continuity. The best way to write a bridge for a three year gap is to look at before and after the gap and logically assume what would happen inbetween....Clearly the writers in power do not have that ability...or they just don't fucking care cause they are making money no matter what shit they crap out onto the animation cells. Its all about will and intelligence. There is simply no will to do something worth while.