Here's the thing that floors me about it. These two have to be the most normal people I've ever seen on a reality show. I know... hard to believe. Dave admitted in one episode how he used to do drugs, bang women all over the place and generally live that rock-n-roll lifestyle, but aside from that they're relatively normal. So normal in fact that they might even be kind of boring.
For example, I found it amazing that, while the wedding won't be cheap, they're watching their budget for the whole thing. They actually believe that certain expenses are too much and not worth paying.
This in part was interesting because we saw Newlyweds (Jessica and Nick) just prior to that. Those two I doubt make the cash that Dave and Carmen do, yet Jessica is so stupid that she bought $1,400 be sheets. I don't think it's a matter of her being spoiled, Ijust think she's that stupid.
Watching famous people in "real" situations is interesting, but honestly it's easier to relate to the ones that are more like me.