Over the years, most people pick up a few games that have great promise and just never live up to the expectations.  Lately I have been running into more "misses" than "hits" in this category.  Creative Assembly has been rolling downhill at a rapid pace of late (Rome II, Attila were bad enough that I am waiting until sometime next year to even consider Warhammer.)  Creative Assembly's demise is a shame to me, since Shogun 2 has soaked up almost 480 hours of my life, and will likely rack up another hundred or two.  Napoleon was interesting, Empire had promise that was ruined by flawed multiplayer, but it is still fun.

Blood Bowl 2 is another great example.  Blood Bowl:  Chaos Edition is a great game.  The AI is decent, the single player modes are amazing, and people still play leagues online years after it was released.  Blood Bowl 2 was a flawed DLC fest to start, but is getting better, and the "next 4 races are free" has clawed them back somewhat.

Which leads me to another Games Workshop PC game - Battlefleet Gothic.  It has great promise, but right now, I can't recommend it.  The AI is kludgy and horrible, the only way to get ships to avoid ramming each other and actually working together is to micromanage everything in "tactical cogitator" mode and there is no way to set a formation.  The basic, "these ships need to move straight forward in a line" is impossible without constant micromanagement.  It is a game I want to like, and I keep playing and trying to enjoy it, but the "game" gets in way of the fun.  And forget having useful camera modes, you are basically stuck in a 3/4 view of the map in a fixed direction and WASD to move around.  Rotating the camera works about 5% of the time.