Obsidian the thread.
New Vegas is buggy as hell? Bethesda is at fault for the engine. Even if FO3 was considerably more stable.
KOTOR 2 is unfinished? They were pushed to release it.
Alpha Protocol has a strong narrative, good RPG elements, and other merits, but is a technical mess and has outdated gameplay? Who cares! It's a true RPG!
I'm seeing a pattern here.
YEs, you are seeing a parrtern of publishers abusing Obsidian.
1) New Vegas WAS rushed (come on, the games developed in, like, a year and even then it was originally supposed to be released later in the year but the release was pushed up a couple of months) and Bethesda's engine is known to be one of the worst game engines on this planet. And no, Fallout 3 wasn't "considerably more stable", that game had fucktons of game-breaking bugs, especially on consoles and especially the longer you played and if you ever added & played the DLC.
Besides, QA is the publisher's job. It was Bethesda/Zenimax who decided to release the game without much QA. So yeah, the blame for New Vegas' bugginess doesn't lay solely on Obsidian's feet.
2) KOTOR2 was, again, another game that the PUBLISHER factually forced Obsidian to ship before Obsidian could finish it. That lead to cut content and a bit of an unpolished feel for all of it.
3) Alpha Protocol was delayed for almost a year but it was SEGA who
didn't pay for Obsidian to use that time to tighten things up. Obsidian can't work on a game, polish it etc., if they aren't paid. So yeah, that's another strike that's more against an idiotic publisher than it all being Obsidian's fault. I'm not saying that Obsidian is the bestest developer at developing great combat or the like (their games can be a bit clumsy), but if they had been given even ~6 months more time, then I believe the games would have been much better for it. And while their games can be clumsy, at least there's a lot more depth in their games than in your average RPG like the kind Bioware & Bethesda push out. Choices you make character development wise are actually meaningful and you really need to think about what kind of character you are building.
This is all points out to publishers not treating Obsidian or their games with any kind of respect. It's the publishers who don't do QA. It's the publishers who move up the release months forcing Obsidian to cut content. It's the publishers who don't pay for Obsidian to polish their games even when there would be time to.
Let's just see what happens now that we've had Ubisoft let Obsidian work on a RPG (South Park: SoT) until it's actually somewhat finished (though, if you know anything about RPGs, don't expect a bug-free game, that has never happened and will never happen with RPGs that offer any kind of meaningful choice & freedom, not Obsidian games, not Bioware games and certainly not Bethesda's games) and with a game that Obsidian is working on in their own terms (Pillars of Eternity).
I'd definitely have to say Obsidian. They get a lot of love here on GAF but most of their games are really mediocre (KOTOR2, DS3, NWN2) they don't make bad games, but they aren't amazing.
It seems you don't really understand the reasons why they are so highly regarded. Yeah, they falter a bit when it comes to combat/controls/UI, but they develop RPGs with actual deep ROLE-PLAYING. People can forget the shortcomings in, say, Alpha Protocol's shooter-mechanics because they can play the game's meat (story/character interactions) in such different ways and feel that their choices matter, more-so than in superficial mediocrity like Skyrim. And that's what a lot of people want out of role-playing games. Maybe Mass Effect is a better-playing shooter (though, I find it's nearly as mediocre as Alpha Protocol in comparison to actual shooters), but Alpha Protocol offers the vastly superior writing & choices -> consequences gameplay, which is almost unrivaled in today's RPGs (especially bigger ones), really.
KOTOR2 is probably the best written Star Wars game ever. If it has any shortcomings gameplay-wise, it's mostly because they had to rush it out and they were using another developers gameplay mechanics as a basis for the game which weren't that incredible in the first place. And while vanilla NWN2 isn't anything super special, it got us Mask of the Betrayer, which is, like, some of the best cRPGing ever created. Then there's Alpha Protocol (some of the deepest choices vs. consequences stuff in games) and Fallout New Vegas, which is again the deepre RPG experience in comparison to Fallout 3, despite Bethesda seemingly trying their best to torpedo the project by forcing them to release earlier than originally planned even when their schedule was already incredibly tight.
Dungeon Siege III was a disappointment, but from what I've understood a lot of that seems to be the fault of one of the lead designers (or someone) who didn't have the best ideas of how to develop a good hack 'n slash and who has since left Obsidian for Bioware or somewhere. The basic gameplay wasn't that bad and due to Square Enix not rushing the game out it was a pretty polished experience, but the coop was botched and the writing wasn't even near Obsidian's top tier stuff.