alot of the issues are cultural and social, the smoking especially. There is a completely different attitude to smoking in Europe compare to American and thats why the non smoking rules are not enforced. The French and European managers at DLP have no interest in making sure the CM's enforce this rule. When the management don't care, why should the CM's in the park at the rides and attractions care.
The same with the rude behaviour of guests. What is deemed rude or inappropriate to an American may be acceptable to a French or German or Italian. A French or German or Italian might see nothing wrong with going onto the grass, behind a fence but an American might never do this in Florida or California.
The general appearance, lack of maintenance, run down air is all down to money. DLP is only partly owned by Disney, where as California and Florida are wholly own by Disney. For example in California and Florida there is a custodial department, CM's whose sole job is to empty trash bins, sweep the ground and keep the ride and attraction queue areas trash free. This department does not exist at DLP. It is the CM's who operate the rides and attractions who have to sweep the ground, empty the trash bins at their ride and keep their queue areas trash free. That's why there is so much trash around DLP as the CM's don't have the time to operate the ride, load and unload guests AND empty the bins, pick up trash etc