I've stayed at every one of the hotels on Hotel Plaza Blvd. and have enjoyed my stay at all of them. As others have mentioned, they are not over the top Disney like a Disney resort would be. But oh well. The only parks that the shuttle buses don't drop you off right at the park entrance is Magic Kingdom & Animal Kingdom. At the Studios, and EPCOT you are no further away than most of the Disney buses are anyway. To me this is no big deal.
The shuttles run pretty consistent every 20-30 minutes and go to other hotels along that road. Here are the buses and which hotels they hit in order for both pick up and drop off:
A Bus
Hilton
Holiday Inn Express
B Resort
Double Tree
B Bus
Best Western
Wyndham LBV
Buena Vista Palace
You can also use the different buses to your advantage as well. If your bus is not there, you can always jump on the other bus and get off close to your hotel and just walk over. We do this all the time.
The "nicest" of all the properties (to me) would be the Buena Vista Palace, Hilton and Double Tree. The B Resort just was refurbished and has a really modern vibe to it now. I don't think you would not enjoy your stay at any of the properties.