The Elder Scrolls IV: Knights of the Nine Review has posted a three-page review of Bethesda Softworks' Knights of the Nine bundle pack for the PC version of The Elder Scrolls IV: Oblivion. Each of the plug-ins receive their own summary, and the entire add-on ends up with an overall score of 8/10.
All in all I felt this expansion/additional content disc is well worth the money if you're a big Oblivion fan. The additional content slips straight into your game and works seamlessly, so no requirement to start a new game or anything silly like that. As such, it's really hard to complain. There is almost certainly over 6 hours of playable content here as well as new additions that will add depth to the original game.

My only problem with this is that there probably isn't enough to entice you're average Oblivion fan out of retirement. A lot of the quests are specific to certain types of character. Where an expansion pack will tend to cater for everyone with a few more hours of play, the impact these mini expansions will have on you is completely dependant on what type of game you like to play.