I really loved Flower-Guarding Bell, but the ending, as you said, was horribly rushed. The resolution of the SNAFU which the heroes found themselves in at the end was just underwhelming, and the final fight hardly even happened. The good guys were just too strong once the Devil Island entered the fray. It was a real shame because the story was really quite gripping, and the characters had a likeability about them which isn't easy to find among Gu Long's stories. It's a story which is dying to be made into a wuxia serial with some minor adjustments at the end to at least give the bad guy a serious final fight with the protagonists. Maybe only have the Devil Island enter the scene once the bad guy has actually been defeated in a fair fight, and he's looking to exact cruel retribution by ordering a full-scale massacre only to be thwarted by the Devil Island, and then dies in a final kamikaze attack against the heroes or something. The way it is written now, though, I'd have to totally agree that it feels like he just lost interest and ended it prematurely without bothering to give the loose ends (and even the main plot) the attention they deserved.