I mean 'good enough' in the sense that it's the sequel to a movie that's massively popular and mostly acclaimed, and apparently doesn't drop the ball too drastically. I suspect when all is said and done this movie will always be overshadowed by its predecessor. I'm expecting a decent, serviceable end, but not a movie that's all that remarkable in itself. I'm not convinced it's as zeitgeisty as The Avengers proved to be, it'll be interesting to see how it fares after the inevitably massive opening.
You make some good points. It will indeed have a massive opening, at worst i can see no less than 155 million and maybe as much as 175 million. I think it will play reasonably strong and probally end up in the 450 million range domestically. But hey, i could be wrong.