I have played over 200 threatening games, and I've seen people kick others for their class/level/banners in threatening only about 1-2 times. Luckily, a good player can carry in threatening just fine, and most of the time players don't mind if there is just 1 very bad player because 3 decent/good players is enough to do well on threatening, at least up to the boss which actually makes sense to suicide on from a gold/time ratio perspective. Of course kicking does occur significantly more on perilous, but usually threatening>perilous for gold so people shouldn't feel bad about getting kicked because they are being done a favor
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I'd say the argument of gear viewing resulting in more kicks is true, but at the same time, it would reduce kicks by people who assume that the person they want to kick is inexperienced or poorly equipped. Anyways, I feel there are significantly more important issues that da3MP needs to deal with before even considering dealing with the lack of inspection.
The lobby leader said "Assassins are Garbage Kick them"
Of course they were a Arcane Warrior.
It doesn't happen often, yet, but it's something that may become a problem in future if folk are already under the assumption that you should only play Reavers/AWs/Eles/Keepers and are outright kicking anyone else.
Throw in gear inspection and someone that may have had bad RNG luck and have say a Fully modded and Runed Level 23 white gets kicked in favour of someone with a level 18 Purple that doesn't do as much DPS or have the right stats just because they see Purple > White without knowing the facts.
Heck my Archer has a fully modded/runed white 23 Bow with 23% APen Innate that puts out disgusting damage, but he'd get kicked because not Purple