Of course no one ever knows what is going on in a marriage, but I think Kyle/Mauricio, Ken/Lisa and even Heather/Terry have fundamentally sound *normal* marriages.
Conversely, it was pretty apparent that Don/Vicky, Tamra/Simon and Adrienne/Paul had marriages that were on life support because spouses who actually care about each other don't interact in that manner consistently.
i don't know why Shannon chose to exhibit her dissolving marriage but god bless her for doing so since it seems to be one of the few authentic things going on in this show. Of course, I find it ridiculous that she would become riled because Tamra spoke about the marriage to Heather - when the whole thing is being shown on television but I also found Eddie's wanting to keep a conversation Tamra had on camera private to be equally ludicrous.
I also found the bedrooms of Shannon's girls to be bizarre. I don't know anyone who has their children sleep in a bed with one pillow and white sheets. You don't have to decorate a bedroom in zebra and hot pink but it looked as if the kids were being tucked into vacant rooms where a bed had been temporarily placed.
I will give Heather a pass on her saying she interacts with people from all walks of life. Heather was not born into extreme wealth and so she grew up interacting with people who aren't as wealthy as she is now. I would assume that she has acquaintances/friends who aren't as wealthy as she - most people aren't. Does that mean she regularly entertains people who work at Walmart - probably not because the people she comes into contact with are going to be at least middle class. I am sure there are people at her synagogue who are less wealthy than she who are in her "social circle" for example. However, I really don't think that she would not be friendly with someone based on their wealth.