I was an intern with Blizzard summer 2013.

They gifted us all copies of all of their current games, up to and including Diablo 3. My friend took me over to the Diablo building, inside they had concept art for possibly many expansions, and a table with a bunch of Diablo gear for the dev team to sign.

I put my copy of D2 and D3 on the table, only learned later of the bad blood between Blizzard North devs and the D3 team. They all signed my copy of Diablo 2, but the reaction to a copy of D2 signed by the D3 team was pretty awkward.

The QA employees also in general disliked the dev employees, definitely felt like a clique environment. QA always talked trash about the devs during dinners I was invited to.

The other big red flag was i actively got to see someone stab their co-worker who was leaving Blizzard in the back to get a promotion.

Also heard the term 'old guard' a lot while in meetings, either you were old guard or you were against them.

I could see all the way back in 2013 that Blizzard was not the company it was in the 90's/00's and it was very sad to see from the inside.