It made almost million going up against two major kids movies, so I think it did okay.It's not doing so well at the box office:
http://www.collider.com/2010/03/27/...ur-dragon-underwhelms-with-122-million-debut/
That and the marketing for the movie hasn't been that great...and it doesn't have such an appealing-looking story or big names attached to it..Well I guess the sequel Toilet Bowl Time Machine is out of the question.
On the other hand with How To Train Your Dragon's lackluster opening this signals the slow death of 3-D releases.