Yes, they do. If I ask 5 different people what their expectation of a sequel is, I'll likely get 4 or 5 different answers. For some, continuity of setting/timeline/storyline/etc. is enough. For others, it's not a sequel unless it's turn-based and isometric. Which definition is correct?
It's no surprise that some people look at FO3 and decide it is not for them. I've looked at plenty of game previews over the years and decided those games weren't to my liking. What did I do? Strangely enough, I didn't post vile, obnoxious stuff across the net. Nor did I make plans to attempt to sabotage sales of those games. I also did not claim bizarre authority to control the direction of the games even though I did not own the IP. You know what I did? I looked for other games more to my liking.
I understand that some of these people have a multi-year emotional attachment to the series and whatnot, but they had to understand that (outside of taking steps like purchasing the rights to the next numbered Fallout or buying the IP) this could happen. Some folks (not anyone posting here) have lost the ability to think sensibly and objectively when it comes to Fallout.
Bethesda did what any good company does: build brand awareness and name recognition through advertising. I don't hold that against them.
That does sound annoying (I'll take your word for it as I haven't read all the previews) but that sounds like the fault of the preview writers, not Bethesda. If I read a horribly written movie review, I think "Wow, what a bad review" not "Wow, what a bad movie."
I'm a bit confused by this statement. Can you point me to some examples of 'slobbering over Bethesda' that you feel completely outbalance the "rabidness" of the NMA / etc. crowd? From what I've personally seen, I can't agree with you at the moment.