is it a happy ending or a broken heart

The optimism of the open ending of Wonderland is not synonymous with a perpetuation of the traditional values which govern "boy meets girl", it does not mean a silly and idealistic mystification of love, it does not respond to to a revindication of the adolescent fantasy of our other half, served on a silver plate by destiny. If the viewer experiences it that way it is because Winterbottom manages something which belongs only to the realm of good filmmakers: to know how to connect the soul of the viewer with that of its fictional creatures, to have finally broken Alice's looking glass, another looking glass.

Sergi Sánchez, "Michael Winterbottom: El orden del caos"