After a short time my main was 500 ... after two weeks that warlock is 520 ...
I think this is not slow nor tedious.
It could be much faster, but I have no so much time and currently play most stuff solo.
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I will say that I don't like that you can only get x amount of better drops per game type. Maybe a tier system would work? 5 kills tier one 10 tier 2 and so on? Play what you like but the progression gets harder through the week till reset?