I was once in chasidishe camp for a summer to help out with a program, and in that time i made some very close chasidishe friends that do very short dating times. We discussed this openly and they all confirmed that their parents do tons of info (in which MIDDOS are thoroughly researched), they marry pretty much the same family background (which solves a lot of problems), and do very little dating in which the goal is to see if they feel comfortable with eachother. SOme come from large families where they are all extremely happily married.
In fact one friend told me that there is nothing like being engaged to someone that u respect, and heard wonderful things about. She said by the time u get married you are so excited to get to know this person better. She said the she spent shana rishona with such a closeness to her husband, all they were doing and were intersted in was getting to know eachother better. And since they were already married they are able to do this any which way they want, without limitations.
U cannot generalize, but Dr. Yael Respler, who is clearly NOT chasidish, and deals with marriage counseling more than any of us, tremendously encourages chasidish dating. She said if this can be done by the litvish/modern there would much less divorces.