I visited this WHS in April-May 2012. At the time, since Nice wasn't on the WH list, I used it mainly as my base for the other WHS in the area and my main reason to visit was to attend a concert. That said, I clearly remember the palm tree lined wide promenade, the luxury hotels and cars parked in front of them, the gorgeous blue Mediterranean sea, and the snow-capped Alps in the distant background - a postcard view seen in so many international movies.
Although Nice's urban development was clearly the product of the tourism industry, and it must have played a clear role in coastal tourist amenities developed elsewhere, at the very least this is stretching the OUV concept a bit too far IMHO. I rated it as one of France's weakest WHS, as of all the French cities, monuments and sites, Nice really doesn't deserve its listing already on a national level, let alone on an international level. I really enjoyed the panoramic views from the Berlanda Tower area of the Colline du Chateau as well as the fine Art Deco details here and there, the elaborate mosaics on the villa facades and the colourful tiles of the many church domes, steeples and bell towers. When in the area, I would recommend also visiting pretty Antibes nearby and tasting the fresh food from the covered market.