@EggHead,
												Well, dude, I get it.  I think you received a lot of really good advice from people across a wide spectrum of opinions.
I couldn't deal with it either.  I prefer non-muss, low fuss people - and a bunch of baby mama drama and messy family relationships isn't something I choose to deal with at this time in my life.
The thing is:  know what you're willing to deal with.  Be honest with the person.  If 
you're getting the honest story - and she's only putting them up to help her kid experience continuity and see her parents as an effective parenting unit who help each other, wow.  What a great thing they're doing for the kid.
If this is partially true, but they still like to get nekkid once in a while - or your money is finding it's way into his pocket - or (100 other things shady things that may be lurking behind this scenario)...  
I guess the word for the day is trust.
Do you trust her?  Is having her in your life worth feeling like a chump as long as this dude is in residence?
Eh.