Valid point and one to not overlook.
I just think, like has been said by quite a few here and elsewhere, there is more to it than that. I mean just how bad is it, if Bethesda can release PS3 versions FO3, FONV, and even the Skyrim-vanilla with a straight face, but balk at releasing a $20 DLC for reasons of quality assurance?
From any POV, just all kinds of bad.
Yeah they all had problems.
And to list the more common bugs that cause alot of issue, the gate won't open at the castle making it impossible to continue, serana disappears forever and I think she's needed for the quest, she has scripts. Radiants repeat which, you can't repeat some of the radiants and that just kind of gets you a bit stuck.
Of course theres more and they do alot of bad, but these seem like the more common ones. Easy fixes on PC but on 360 you can't do a thing. Same with PS3.
Seeing how PS3 always has MORE problems than 360, there'd be even more bugs that are gamebreaking and more common I'd assume.
Now I played dawnguard on PC. I had some weird issue where the entire town of Riverwood would try to kill me, no bounty or anything. And someone else had a glitch that let them kill Delphine. If I were to experience both those glitches at once on a console, it would destroy my main quest.
I also had the issue of NPC's attacking each other when I needed both alive and quests were done. They're both essential so it just kept going. But I'm on PC so I was able to stop it with a few console commands and stuff.
It's why I say PC even got dawnguard in the first place, console commands and mods
The main issue with the PS3 seems like it has a new world with each loaded game for whatever reason. I take that as, either you start at Helgen again, or everything resets and you just keeps your stats items and placement. No idea though.