Sounds more like nostalgia goggles to me.
That's a good theory except I played FO1, FO2, Planescape: Torment and Arcanum for the first time all within the last year. I don't think nostalgia really applies in this case. Simply put, those RPGs are better than any RPGs that have come since. Better writing, better choice and consequence, better character development options, etc. The only advantage new games have over the old ones is in presentation.
They can and do support their games, do I need to link patch histories here?
Sure, why not? Please link the Bethesda patch that fixes the game-breaking bug in Oblivion where animations start slowing down and stopping if you've played the game for 200+ hours. Please find me the Bethesda patch that fixes the 1000+ bugs fixed by the community patch. Please find me the Bethesda patch that fixes the 250+ Shivering Isles bugs fixed by the community patch. How about a FO3 patch to fix the VATS pausing issues and broken accuracy perks introduced by the official 1.1.035 patch?
You also cannot foresee every potential problem or bug.
I agree. However, the more QA you have, the more likely you are to find rare issues. Also, once the community finds a game-breaker or broken quest, there's no excuse not to fix it. But Bethesda doesn't. That's why the community patches exist.
Really the bottom line is you just want to bitch.
No, the bottom line is that Bethesda's games are not polished because they have broken quests, game-breaking bugs and various stability issues. In addition, Bethesda does not have good support because it does not fix the broken quests, game-breaking bugs and various stability issues that players encounter.