There is one proper way to succesfully come to a conclusion of this debate. If roleplays are irrelevant (like on BSpot's Lag Party), or if they use incorrect stuff, completely stupid players etc., then the roleplay becomes bad. If it uses good brick packs (like mentioned before), in a relevant server, and/or the players are good, and follow the storyline, then it's a good roleplay.
TLDR;
roleplay wrong = roleplay fail
roleplay right = roleplay WWWIIIIINNNN!!!!! :D