This is obviously inspired by the http://www.gamesas.com/topic/1493698-most-wanted-unannounced-sequels/ about the sequels you want the most.

How about your most unwanted sequels? Is there a video game series that you'd prefer to take a break and not produce (announced or unannounced) sequels anymore? I'd be curious to know your reasons as well.

Halo, Gears of War. To me, Halo ended with 3, but I didn't mind a prequel, and I thought it was an amazing game. Gears should have ended with 3, but unlike Reach, they should have just let it go.

Blizzard's WoW. Seriously guys, just focus on Titan and make it revolutionary. I want to play something new and blizzardesque before I die. The other studios are trying hard but the results are sub-wow-standard.