The blur is because by default Maya bakes plug-in nodes at 64x64. If you go to the "Textures" menu in the UV Editor you should see a list of images used by your material. Selecting one of them explicitly will display it at full resolution. You can also increase the resolution at which node textures are baked, but it will slow down Maya a lot, so I wouldn't recommend it.
The materials should be green in the "shaded" viewport mode (what you get when you press 5). Are they still green after you press 6? The textures will be low-res in the viewport with the 1.7 plug-in due to a limitation in Maya which I've explained
in this post. You can increase the resolution, but even 256x256 will cause Maya to slow down noticeably.
The 2.0 plug-in uses the material colors in the shaded mode, instead of green (but no textures, of course). We've also made significant efforts to bypass Maya's viewport preview mechanism so that now we can use higher resolution textures in the textured viewport (the default is 256x256, but increasing it to 1024x1024 will not cause a drop in performance if you have enough memory to store the images at that resolution).