There are a few regular offenders that could be turned into cards, among the most important ones a negative commendation card for ignoring champions (literally running past them and skipping to the next room of the level), bad communication, intentionally killing allies, etc.
People should see in-game what quality of player some are in random matchmaking. They should be able to look at their profile and be like "ah yes, that guy skips champions a lot, better I focus only on champions or leave and find a new lobby instead". Or "ah yes, that guy is griefing others a lot, probably by slamming them into walls with eagers edge sword perk or with shoulder charges". Or "ah yes, that guy is cussing/insulting others a lot".
[b]Edit 1:[/b]
[quote]Even if it would be abused. It won't really give those players any real handicap aside of maybe a bad reputation within the commendation system... And let's be real. How often since its introduction did you look at other peoples scores and actively sorted them out in LFG or anything?
It is complete a cosmetic thing. Aside of that, negative commendations could also reset every season, rendering a long-time downside obsolete.[/quote]
/rant over
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Nah, you can give them a try harder commendation because you might hurt their feelings.