TVB's LOCH '82 series is one of (if not THE) my all time favorite wuxia adaptations, but that doesn't mean I don't have some issues with it. I haven't read the novels, so I'm not (and can't be) a stickler for accuracy of adaptation, and some of the deviations...such as the much more fleshed-out characterization of Yeung Hong, actually were great ideas. But...
I feel that if LOCH '82 had a weakness, it's that certain subplots just went on way too long. For example, the story of Yeung Teet Sum and Pau Sik Yerk: I like these characters, and their story isn't innately uninteresting, but...I don't need TEN FORTY-MINUTE EPISODES focused mostly on their separation and its aftermath. That part of the adaptation just went on way, way, WAY too long. I've been told that the novel depicted their reunion and eventual suicide together as a matter of just one night, but LOCH '82 stretched this out over ten episodes that must have covered months and months of story time. I like the story of YTS and PSY, but...I just don't need NEARLY that much of it. Much of that time could have been better used on more fight scenes or to focus on Gwok Jing and Wong Yung, or the background of the Greats, or something else more interesting.
Ditto the subplot of Yeung Hong and Muk Lim Chi's relationship. It wasn't bad, and the characters weren't unlikable, but again, it just stretched on for way too long...with too much back and forth melodrama that got repetitive and frustrating after a while, and could have been handled in a much more condensed way.