I used to hang out with my old in-laws, but I didn't really have any respect for the way they raised my ex. If I met them now, I certainly wouldn't hang out with them, anymore - I'm not into the partying, drinking, pot, etc. anymore...
My current in-laws are wonderful people, but they live a long way from us (we're in Vancouver, and they're in Knoxville). They call every Sunday, and we see them one week a year, when they come here to visit. If we lived closer to them, I think my MIL and I would be reasonably close, as long as we continued to avoid discussing religious, and some social, issues. (My in-laws are deeply religious Christians, and also social conservatives...I'm semi-liberal, more so as I get older, and completely non-religious...I don't even consider myself to be a spiritual person - that entire aspect of life completely confuses me, and isn't on my radar at all.) I think my FIL and I would reach a state closely resembling an armed truce. He's a really good man in a lot of ways, but he likes to stir the pot (he and dh have semi-friendly arguments about everything) and doesn't know when to quit. I also think he's a bit of a control freak, in little ways. I tend to bite my tongue around him a lot, and I'd have trouble doing that if we saw them all the time.
So, I wouldn't really say my in-laws are my friends, but I love them to bits, think they raised an amazing man in dh, and think they're good people. They just come at a lot of aspects of life from the opposite direction to me. We do share quite a few values, but not so much on others. And, when I'm getting frustrated with my FIL, I tend to focus on the positive...like the fact that they've taken ds1 in as their grandson, 100%, with no reservations whatsoever, from the moment dh and I got together. I've read - and seen - enough blended family horror stories to know how precious that really is.
Actually...the Disney trip kind of summed up my contradictory feelings about them. Back in 2006, our Christmas present was a trip to Disney World, for the whole family. We went in March, 2007, and were actually there for ds1's 14th birthday. They paid for our airfare, accommodations, and theme park passes. The reason they did it when they did was because they felt that ds1 was on the cusp of being too teenage, too cool, too whatever, to enjoy it, and they wanted him to have the experience before he reached that stage (he never did, but this was based on the reactions of dh's younger brothers when they were teens). They plan to treat us again, when the other three are a bit older - I'd guess in the next couple of years. But ,this trip was really for ds1.
On the "pro" side (go in-laws!!): They went to huge trouble and expense to provide a once-in-a-lifetime experience for their son's stepson. They were all about following our lead while we were actually at the parks, and going to whichever theme park we wanted to visit, etc. They'd been before, so sort of acted as our hosts, and talked about options, etc. before we planned our days. They made a point of doing something really fun for ds1's actual birthday. I mean - it was huge.
On the "con" side (we're very different - ugh): I'm really not into Disney that much, and big crowded places like Disney World are my personal concept of hell. I simply didn't want to be there, at all. I never told them that (because I think throwing a multi-thousand dollar gift into someone's face is beyond churlish), but it just kind of underscored that we're not on the same page. They visit, as a couple, occasionally, and I can't even imagine myself doing that....maybe once, if dh really wanted to do it, but it certainly wouldn't be a regular thing. We treated them to a nice dinner in one of the decent restaurants on our last night, and my FIL insisted on paying for...think it was the drinks. He's done this before, and it really, really bothers me. They spend all this money on us, then when we try to do one nice thing (as a thank you of sorts), he'll get all "oh, you're a young family starting out" and pay for part of it. This isn't really a bad thing, as such - it's just something that I feel is rude. I have lots of things like that with my in-laws, because we're just very different people. Oh - and it doesn't help that I'm seven years older than dh. My FIL, in particular, looks at me as being his son's age. I'm not. When I met his son, I already had a failed marriage, and seven years of childrearing behind me. I wasn't a "young person just starting out". If anything, I was a semi-young person starting over. I'm just not even remotely in the place in my life that he sees me as being in, and sometimes, it causes a lot of friction...especially as he's the type to hand out fatherly advice, and it's frequently on things that I already have adult experience with and have already formed my own (different) views on.
So, yeah - overall - wonderful, wonderful people, even FIL. But...if we lived closer to them, I think FIL and I would be in a state of armed truce in very short order.