Simple guideline: a modest success is better than a grand failure. If you make unreasonable claims, I assume that everything else you say is a lie, and your game will be a parade of delays, disappointments, and broken promises.
Nicodemus hates this guy. Why? Because “CEO” means “you should know better than some idiot on a forum saying, ‘u cant beat wow for with like a billon dollars.’” Spore? Good luck with those expectations. LotRO? Best expansion evar or die. Vanguard? We saw that one. I expected more from Half-Life 2 because the box went on about its being the highest-rated game ever, but it came with the far-more-entertaining Portal.
A successful niche game is a great thing. It knows what it can do, and it does it well. If you want that thing, it is there for you. If not, you are not just getting a bad knockoff of something from Blizzard or Sony. Whatever jokes I may make about Alganon, I respect the David Allen interview that translated to “we’re making a pretty decent DikuMUD/EQ/WoW knockoff that does some stuff differently.” City of Heroes developers humbly remark that they did not know the costume creator would be popular.
Our industry sucks because we accept buggy releases. The PR for our media sucks because we accept unreasonable promotional crap. “Everyone promotes their game that way” is the same thing as “every game ships with bugs.” Some people do a better job, and not everyone spews exaggerations and blatant lies. And some people can live up to the hype.