Monster House's main problem is that it has no audience in mind. Adults won't like it because its kiddy and cheesy. Teens won't like it because its cheesy enough to vomit at and doesn't have blood and guts. Little ones won't like it because its scary. 7-12 year olds might be the suggested age range, but what can they find in it? Even they'd like something more exciting. It has no audience in mind, and it crashes and burns. I can't believe people were actually calling it the next Goonies. THAT was a kids movie. Every kid could relate to it in some way. Not Monster House. At all. A monkey smoking dope could have come up with the plot.
Back on the topic of 3-D....I don't know about the rest of you, but I think Borat should be in 3-D!