Jim, Jim, and Jim: Thai Roma is a gimmick of things past, to be avoided, unless you're stuck on the Hill after 8pm and haven't any frozen waffles at home. There's Thai in DC (about average, if that; Duangrat's is *way* overrated; they fry, and refry, everything), and there's Cajun (or at least there used to be), and you don't want the twain to meet.
Thai Roma has never been praised highly in the local press....but in Alexandria, there is a place called Cajun Bangkok, which is quite good. (Actually I haven't been there in a couple of years.) Instead of fusion, there is a Thai side and cajun side of the menu--they do seem to complement each other well.
I live about 4 blocks from ThaiRoma. To be honest it's been about 2 years since I've been in there, so I don't really know how things are at the moment. (but maybe that should tell you something about how things were). It's in a nice location, the atmosphere is pretty cool, you can get outside seating and it's near some of the Hill's liveliest bars like Hawk 'n' Dove and Capitol Lounge.
As for the food, I'd say that the food varied wildly - some nights great, some not so good. My impression is that although the concept is clever, they've moved from trying true fusion cooking (mixing Italian and Thai) to basically a Thai restaurant that has a few italian items on the menu. I don't think that they really carried off their most adventurous dishes that well. I think they do Thai pretty well, and actually, you've reminded me I ought to consider eating out there some night in the not too distant future. If I do, I'll come back and post how things are going now.