I think it was a nice improvement that players did not know who they were picking for. The possibility of players creating their own role really opened up the fake claim options as well. Introducing a couple non-submitted roles (while omitting a few of the player created ones) might make fake claiming even easier.

The problem with all blue games is that everyone wants to be superman and that leads to really swingy games. Players that don't wind up with overpowered roles are disappointed, yet a game full of them is too rough on mafia.

Even normal roles like detective or 2-shot vig become too powerful in a setup like this because there is too much role synergy when everyone has an ability every night.