Uh, Disneyland Paris was not a "failure".
The larger Disneyland Paris Resort overbuilt it's hotels and overspent in the begining; however, it is still the #1 tourist destination in all of Europe, and by just about any definition that is a success.
Disneyland Paris Park is actually in the running for the most beautiful, themed, detailed MK. They have superb adaptions of classic attrations (remember, these were built with 90's tech, not 60's, 70's, and 80's) like Pirates, Haunted Mansion, Peter Pan, Space Mountain. Their Pirates has the best human AA's before the new Pirates additions stateside, and their other dark rides are just a notch above what we have here.
Disney Studios Paris is not the best park in the world; in fact, it competes with DCA for "worst" (of course, worst for Disney is usually better than anyone else's best). It does have some great attractions (their RnR is awesome) but there is major development going on and hopefully someday it will develop more as a park.
However, even though it took them a decade to make it into the black financially and for the resorts to finally stop being the money-sinks they originally were, just about every other aspect of Disneyland Paris is a qualified success.
AEfx