Agreed. Sure wish they cold have done the full 5 season arc instead of the hurried finish due to impending cancellation. The fifth season was near horrible.
Studios, networks which make these series - like Defying Gravity, really suck when it comes to making the original ideas work, usually canceling or cutting funding. Then they move on to more profitable and arguably brain dead sitcoms and the like, is it any wonder a lot of people have just turned their TVs off?