We were there on Thanksgiving day last year. It was a ton of fun and not nearly as crowded as the parks here in the states.
Not sure if that will be true in the summer or not. The theming is not as strong as in the parks here, but that was also fine.
We were able to do all of the big rides in both parks (several of them multiple times) in a single day. Hyperspace mountain (space mountain Star Wars style) was great and actually has a couple of inversions. There is an avengers ride that is the same track as rockin coaster in Orlando, but the track seemed a little smoother and was a more fun ride. Big thunder was great as mentioned above. Crush's coaster is probably the most popular ride there and I don't think it's at any of the other parks yet. It's a neat ride that is a mild-moderate "thrill ride".
We stayed at one of the park hotels the night before our park day and then the night of our park visit. We took a car from our hotel in Paris because we didn't want to mess with our luggage on the train, but if your kids are old enough to deal with their own luggage on public transportation, they may be the way to go. Traffic was brutal and it took nearly 2 hours for us to get from central Paris to the hotel. We did the stay at the end of our trip, so left from Disney and headed to CDG the morning after our park day.
TLDR/ it's a lot of fun and not as crowded as the parks here.
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