The Official Campaign in my opinion and many others is terrible. It's a boring hack fest without a good story/dialogue and bad item drops. Some modules are good but in general it's just hack and slash except not as good as Diablo 2/DD are at it... (D2 for pure hack, DD for more rpg hack).
Also some of the skills are useless (especially in official campaign), mainly the non-"combat" orientated ones.