This may be the first instance of a fanbase being angered over the announcement of a sequel, but Left 4 Dead followers revolvted against developer Valve when a follow-up was announced at E3.
Valve promised additional content for the original game it has yet to deliver, and numerous people took exception to this. They started petitions stating they wouldn’t buy the sequel which is coming too soon, but Valve quickly extinguished the flames. They fully reiterated their support for the first game, including the level editor and additional content. They also plan on interoperability between the games so the community isn’t split in half. Smart response Valve, but whether or not they follow up remains to be seen.