We went To Disneyland Paris (we are in the UK so it is a 2 hour train trip for us) and HATED IT! In my opinion, Disney should be ashamed to associate themselves with it and it lets the Disney brand down in so many ways.
The staff (and other guests) were on the whole rude and unhelpful. Despite the park having Designated Smoking Areas, they were not enforced even in the loosest possible sense (we had people smoking in the line for rides!). At the time, we were smokers and we stuck to the rules, but I really didn't appreciate people in line blowing smoke in my kids faces.
We stayed at a higher end Disney Hotel (Newport Bay) which was filthy dirty and poorly maintained. Day 1, I tripped over carpet that was not stuck down properly. For our entire 5 day stay, there was a bag of trash outside the room next door (which was a hotel bag left by room service). My daughter got food poisoning. We had half board (breakfast and dinner).
On our final day, we were walking outside and saw a young kid (around 13) who clearly had learning disabilities. He was crying and frantic and was crying out for his father. We watched as 3 members of staff walked by him, looking in his direction and walking on by without stopping to help. My DW and I went over to him to try to help, but he was French and neither of us speak French. I did some French at school (many moons ago) so I could work out that he was lost but couldn't communicate with the kid. We took him with us and tried to find someone from the hotel but when we explained they look at us and this poor kid like we were just a pain in the backside.
He was eventually reunited with his father but we did not even get a thank you from the hotel staff or the kids father!
All in all, it left us feeling that we'd wasted a lot of money on a rubbish trip and that the parks that are not owned and operated by Disney which most of the parks outside the US are not (they are run by other companies who pay Disney to operate) are just not up to standard. For that reason I would not travel to any of them for fear we'd have another rubbish time!