I played in Inner Sanctum and SK Gaming throughout TBC and had a pretty good run, getting a lot of top 5 kills, some top 3 and even missing out on a world-first due to half the UK losing Virgin Media Internet and delaying us for over an hour on our Brutalis and Felmyst kills (when we did get back online we killed it 10 mins after SK so would have easily smashed worlds first hehe).
Anyway, min/max culture for us at least was in effect since the AQ gates opened, I don't really remember any toxicity since alts and out of guild raids and so on never really happened. This time around I would expect a huge increase in both, that's just how the game and mentality has evolved. Get a nice guild and forget the rest
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I first stopped playing wow when I got a job at Blizzard which was just at the start of WOTLK as an Operations Manager and I remember reports of ninja looting, verbal abuse/threats, and other stuff going through the roof. Perhaps I had rose-tinted glasses on in TBC but I can't remember it being that bad in TBC.
Eitherway, easy to avoid if you don't mind getting a guild, but, always dicks about no matter what.