They’re not my in-laws yet, but here goes:
Likes: They are really kind and understanding and very good at compromising. And make an effort to include me in everything, even though I’m only a girlfriend.
Dislikes: Well, mainly that his father is so anal. And his sister-in-law is exactly the type of person I probably wouldn’t be friends with normally but am being forced ot be now.
*Note: Yes, I am trying anyway.
Like: they enjoy life, and eating, and drinking, and movies, and nice hotels and restaurants.
Dislike: They keep things in and let their grievances leak out in weird ways. Almost what I’d call passive/aggressive. My wife is quite different than all of them in that regard.
My family just gets stuff out.
Since my wife died two years ago (this July will be 2 years. she was 38 for those of you who don’t know me) They have become radically different people. (wife was an only child)
Likes… I get along with them better now than I ever have. They’re pretty nice people actually. I make sure my kids stay in their lives as they are the only link that exists to their daughter. They are very supportive of my children, and their activites, etc. furthermore they are very financially supportive of them too, even though they don’t have to be. (as an example, I sent my younger daughter (age 15) to math tutoring. I would have had no problem paying for it either way, but I asked if they wanted to split the cost with me, and they were behind that 100%. I figure it also intwines my daughter with their lives that much more. When my daughter would do wel on a math test for example she would call Grandma to tell how she did on it. I encourage my daughters to make random calls to their grandparents just to tell them trivial news like that so that they are intimantly involved in each others’ lives.
dislikes… MIL is still an old pro at divide-and-conquer which was a MAJOR point of contention when my wife was still alive. quck background: wife and her parents NEVER got along. When they would visit from Tulsa (we live in Atlanta) MIL would always manage to get my wife alone and grill her about something, or just generally make her feel like crap in some way. ANYWAY, MIL will get one of my kids alone and try to get info from them about various things. Not so much of a problem now as my kids have been coached, plus I’m pretty careful to always have my girls visit them together (ages 15 and 19)
E3
Likes: I feel very welcome whenever visiting my in-laws home. I’m particularly impressed that they welcome my father to many of their holiday celebrations. This means a lot to me since my mom passed away a few years ago. Hence, holiday celebrations on my side of the family have waned.
My in-laws have also been very willing to baby sit our kids whenever we ask. This has made life much easier for my wife and I.
Dislikes: I have a hard time talking with them about religion and politics. These topics come up fairly often. My in-laws tend to be very conservative in both areas. I have a hard time relating to their way of thinking.
I’ve learned a lot about various right-wing conspiracies from my in-laws. It’s amazing how people that can be so loving to family and friends can be so afraid of the government and society (the man). I don’t believe these conspiracies. Unfortunately, my wife tends to take whatever my FIL says as the absolute truth. I have to deal with the effects.
I tire of hearing about the latest snake oil remedy. I don’t know which form of salvation in a bottle remedy my FIL will discover next. That reminds me, I appreciate some of the sarcastic humor that we share at the family get togethers. 
Dislikes - My FIL has a tendency to snap at my MIL in front of others. That gets real old real fast, especially since she is a wonderful woman who would do anything for anybody. He just seems to get so impatient with her. Course, she has no problem telling him to get stuffed when she’s had enough. 
Likes - They are really great, kindhearted, giving, generous people. My mom lives alone in Calgary since leaving my dad, and they would truly welcome her at every family affair if she wanted to come. If we need anything, we know we can rely on them for whatever.