Pretty much every game developed by Obsidian, Troika, Black Isle, and Bethesda?
Seems to be an rpg thing. Game gets released with a load of glaring flaws and problems which are then cleaned up either by the developers themselves, the fans, or a mix of the two to reveal the fantastic game underneath. Certainly the case with every single Troika game from Arcanum to Temple of Elemental Evil and finally Vampire: Bloodlines. Obsidian also has that flaw, with Kotor 2 and Neverwinter Nights 2 both in a wretched state on released before in Kotor 2's case being fixed up by the community, and in NWN2's case by support from the developers.
As for Bethesda, they made solid games on release... it's just their games tend to get better over time as more modders work to improve and change the basic game formula. Bluntly put I haven't really enjoyed a Bethesda game out-of-the-box since Morrowind, but given time and the dedicated communities work and even games which I otherwise found boring are given a second life.
Hell, here's a fun one for ya too: World of Warcraft. I remember when the game was first released there were so many server and client problems that crashing was a regular issue and so many glaring flaws and exploits were possible I'm kinda amazed WOW ever became as big as it has. But then I guess that's what continued support from a developer can do!