Compared to all stars, no, DVC is not that great a deal IF you only care about having a place to sleep, shower and dress. Realize that when you buy into DVC, the minimum accommodations (studios) are really more along the lines of deluxe hotel rooms and then some (fridge and microwave in the room). When we bought in we compared it to the AP rate at deluxes ($169+tax at the time) and found the studio to be a very good deal. You can probably save a bit on food even in the studios if you stock up the fridge and use the microwave minimally for breakfast, but for other meals as well.
If you are looking for a way to go more cheaply than the all stars then no, DVC is not for you. If you are looking for a way to get deluxe level accommodations for moderate prices, then DVC is for you.
Just to give you a simple idea of numbers, at $79/point, SSR will cost you $1.58 per point per year (that's the cost to buy in divided by 50 years). With dues at about $4 and rounding liberally up, say those points will cost you about $6 each. for 150 points that would be $900/year. Dues will go up changing that number slightly but so will rates at the all stars so let's just assume dues and resort prices go up at the same rate. Can you see spending $900/year on room only? What time of year do you plan to go? What does that 150 points buy you for your $900/year?
If you plan to finance that changes the scenario somewhat. Some people take into account lost income on the money you spend for DVC but we never did. Hope that helps and is not confusing!
Lisa