Some players cheat and I have the feeling A-Net doesn’t have the man power to deal with the problem. This includes botters, sync-joiners in pvp and some things you can do in wvw. Sometimes A-Net doesn’t even acknowledge that the problem exists (sync-joiners).
I suggest that Guild Wars 2 implements a tribunal system similar to that of League of Legends. Now, you may not like that game but this isn’t about the game but about dealing with reports. Here’s a FAQ about the tribunal system: http://na.leagueoflegends.com/tribunal/en/faq/
I have read that Riot says that the punishments handed out by the tribunal system has never been harsher than what the staff considered adequat punishment.