>I know a lot of you may have cut your teeth on MySQL which, in its default configuration, will happily truncate your strings if they are bigger than a column. Guess what? Anyone serious about databases does not consider MySQL to be a proper database with those defaults. And with this, neither is MongoDB, though it may have its uses if you don't need to be absolutely certain that your data is stored.
Nice ad homien there. MongoDB isn't DB2, just as MySQL wasn't. Both can still be used to build very good products; in fact, I'd go so far as to say they lead to better products than "proper" databases.