I am going only on my impression of the stuff, but I have to say EVERYTHING I hear or see regarding PEX convinces me it is the way to go any more. No reason for copper lines to be run in any new construction or remodel in my opinion.
It sounds like your experience with it is with economy installations (condo and dbl wide). Pretty much every reference I've seen it is being used on VERY HIGH END installations for everything, hot/cold water lines as well as in floor heating. The tubing used for heating has to have oxygen barier, but still the structural part of the tube is the same stuff.
I'm sure what you've been exposed to has soured your impression of the stuff, but do some research and you may come away with a better opinion than what you have now. A few hours researching PEX online, or at plumbing supply house, home depot, etc. certainly sounds more appealing to me than crawling under your home to sweat multiple fittings together.