I've researched it in the past and will point out a few things. (I've never actually rented DVC points myself, though).
There are definite pros and cons of renting DVC points vs getting a hotel room.
Renting DVC will almost always provide you with a bigger room (suite) at a pretty low cost. They are also located at the deluxe hotels, meaning not only that the facilities are really nice but also that they mostly have terrific locations close to parks. DVC resorts have their own pools and other facilities, plus you can use those of the hotel as well. They will have good sit down restaurants as well as quick service. DVC rooms are timeshares and they will have certain utilities such as washer/dryer and kitchen facilities within the unit, though this depends on the level/size of the unit.
When you rent DVC points, you are renting them from the DVC owner, not from Disney. The owner must make your reservation for you. You will have to provide all necessary info to the owner so that the owner can reserve your room. And you have to trust that they will actually do it, and do everything correctly. This is hopefully where the broker website can simplify things.
With DVC points, you are renting a timeshare. I know that the service is a bit different than a hotel but since I've never stayed in a Disney timeshare I'm not in a position to really comment on that aspect.
If you rent DVC points, it is most likely that you will NOT be able to cancel your reservation. I think this is the biggest thing to make sure you look into before booking. If you are fine with not being able to cancel, then it's no problem but just make sure you clearly know the rules before jumping in.
With Disney hotels, if you make a hotel-only reservation, you can generally cancel or reschedule up to the day before (I think) with no penalty.
For me personally, the cancellation thing is a big deal, and that's why I've never rented points.