I think it's unrealistic to think everyone chosen to be matched has honest motives about being married and being 100% because it's a reality show. And it's the 3rd season of this show in particular.
I do agree that Vanessa has really poor communication skills. She needs to grow a pair and tell Tres how she really feels. But in all honesty this is such a pressure cooker kind of situation where she probably doesn't have a lot of time to sort out her feelings to a place where she can communicate them properly. I was rooting for them early on but I see where her expectations are too unrealistic. Along with her poor communication skills and a husband as laid back as Tres...it likely won't work out.