I've seen the Eiffel Tower. The Eiffel Tower is my friend. This, sir, is no Eiffel Tower (of course, most forumers aren't old enough to remember Lloyd Bentsen, so this probably isn't very funny...)
It is absolutely true that many great works were misunderstood in their day and no one can say with 100% certainty that L'Arche d'Ikea will not become a major Atlanta landmark celebrated in poetry and song (and postcards). But I think that most "misunderstood" architecture was misunderstood because it was daring, bizarre (as Eiffel's tower was considered), or otherwise strange. L'Arche d'Ikea is none of these -- it is very tame, very derivative, appeals to very middle-brow tastes (gee, Ma, it's like we're in Par-ee, France!). We get it. Really. It is not mysterious or weird. It is just tacky and sad. That's why I don't think this will become any more of a landmark than the pathetic torch sitting on the east side of the Connector that does little more than mock Atlanta.