Which books from 40k are disappointing to you?

Although i love Gaunt Ghosts, Necropolis, despite popular opinion felt a bit tiring and uninteresting.

A constant battle to describe hive city warfare and hardly saw the main characters do anything, except the obvious part.

Ghostmaker had memorable moments, a last twist for a change of pace, action taking place in multiple environments, character progression.

Other titles like caves of ice and Brutal Kunnin are straightforward but at least bring some humour and lots of different fun moments.

Your opinions?