I am in a dynasty with 4 draft picks per year. The idea has good and bad sides to it.
The good side is that it makes it feel like a more realistic experience. It also gives more choices for the future for teams that have an old team and need future insurance. Also makes more trading options.
The bad part is that first of all its a little confusing to keep track of all the picks traded back and forth. Also, people don't understand that the #1 pick is not ranked as high as it is in the real NFL. No, I will NOT give you Amani Toomer straight up for your 1st round pick. I don't care that he is getting old, I am not willing to part with a good #1 reciever for a mere 1st rounder. Also, it usually ends up that a lot of people do have a young team and then everyone is willing to give up their draft picks without realizing that those picks are their future. If there is an owner who automatically claims he is willing to give up all his draft picks this owner is likely either a rookie or is not planning on staying in the dynasty for long.
Zito is God in the Baseball Cafe