I shouldn't have to make a list for you. It should be fairly obvious if you've done any raiding. Bad play involves more than putting up sub-standard numbers on a DPS meter, like dying repeatedly to simple mechanics, or failing to heal yourself (tunnel vision), or switching targets too slowly (or not at all), etc... All of which can be observed without the aid of an addon if you're paying attention to your surroundings -- which you probably are, because it's a core component of raiding.
I meant "bad" in the context of the post I was replying to, which I quoted. Reference the quote if you need to.

MMO-Champion
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........THE WRITING'S ON THE WALL !!!!!

