The view from the streetside is great - and, as many reviewers have commented, so is the difficulty of getting a good shot of this place from the street, because of all the traffic. As the guide said when we crossed the street to visit this place, "Stay on my left, follow me closely, don't move until I move, and if it's our time, it's our time", which pretty much sums up the style of driving in Jaipur.
Having said that, it is worthwhile to not only take a photo from the street side of the facade of the Hawa Hamal, but to enter it, despite the relatively high entrance price for foreigners (for how small it is). There isn't much inside, but the courtyard is pretty, and if you climb to the top, you can get great views over Jaipur and the nearby City Palace area to the west, over Jaipur toward the Amber Fort to the north, and over the amazing street traffic in adjacent streets to the east and south. (No wonder it's hard to cross the streets!)
Also, if you go into the Hawa Mahal, you can imagine what it might have been like to live in this complex, with your only view of the world being the view out the honeycombed windows (designed to allow you to see the outside world, but for no one else to be able to look in to see you). Those windows are part of the reason the Hawa Mahal has such a stunning facade.
We entered the Hawa Mahal from the west side. We had visited the City Palace, and the Hawa Mahal west entrance is a short walk from there. This is an easier way of getting to the entrance, and recommended in preference to the streetside entrance if you are already visiting the City Palace or the Jantar Mantar observatory.
Overall, this was an enjoyable visit.