I've never had the pleasure of punting with a Romanian, but I have Czech, polish and Hungarian, and apart from the Czech, they were fine.
But I think, and it's just my opinion, that the problem, as it were, may not just be nationality. You can have shit wg's from loads of places, including England, and I'd suspect it's more down to doing a job they aren't happy with. I hate my job - I do it and I do it well, but I don't like it, and as a result I'm not the most cheerio fella while doing it (unless the customer is a pretty girl, haha). I'd suspect many EE girls here work as prostitutes because, and no disrespect to them, that's all they can work as here (in many/most cases). Doesn't mean they have to like doing it.
I'd also say that the knock on effect, mentally, of doing a job they don't like or enjoy, leads to resentment of it, and ultimately coldness. Familiarity breeds contempt and all that.
If you wanna go deeper psych wise, the constant fuck>leave, fuck>leave, can easily leave the brass feeling resentful of men, lonely, unloved, etc etc.
So there's plenty reasons IMO. Id never expect a brass to give me the same treatment and passion a girlfriend would; of course I would love a brass to really out the effort in but can you blame her when she doesn't? It's not like its tesco and you can complain to management or customer services!