Should I expect griefers on a regular basis at end-game?

[waycool]

"Only" level 40 so far but all the people I've played with duty finder have been friendly, no idiots yet, but I'm sure I'll eventually run in to some. Some kind of a reputation system would be fine in my opinion, but only in case that one can only recommend (or something like that) other players. If players were able to give negative points to other players that might quickly lead to abuse...
But, I'd guess after the first month is over the worst of the bunch will leave the game and the situation will improve.