If the question is if Unity can do interactives as smooth and stylish as Flash I think you may soon find out. Carlos Ulloa of Papervision 3D fame has kicked it up a notch in Unity 3D with this interactive very reminiscent of the Ford Focus demo that helped bring in Papervision 3D for flash in style. Gotta say though a mini is much better than a Ford Focus.
Flash is still the leader in web interactives and even marketing interactive 3d, Unity largely replaced Director and tools like it and high-end hardware rendered required interactives and games. This interactive by HelloEnjoy has loads of polygons, unity physics system, lighting, environment mapping, showroom cameras, reflection, skid decals, highly detailed mesh and more. Just take a peek inside the vehicle and at the rims for the detail that is impossible with the 2000 poly limit of Flash 3D software rendered engines.
Web interactives this heavy aren’t doable in a non hardware rendered player like Flash. Unity is looking to pretty much own this level of quality in a browser. I don’t think I have seen another interactive looking this good with Unity 3D.
Unity still is lacking many features that Flash has in support of making interactives for the web such as webcam support, mic support, better video support, better gui system, html support (although flash barely) and a larger install base but Unity could easily take the high-end advertising market in addition to owning highly immersive games that need hardware rendering which it is already doing for web gaming. It is 2010 soon, most computers have a decent video card. Put them to use!